Learning Go Programming Training Course

1. Introduction to Go

• What is Go (Golang)?
• History and design philosophy of Go
• Go as a web and systems programming language
• Key characteristics:
  • Static typing
  • Simplicity and readability
  • Fast compilation
  • Built-in concurrency
  • Garbage collection
  • Cross-platform compilation
• Common use cases for Go
• Advantages and limitations of Go
• Go compared with C/C++, JavaScript, Ruby, Python and Java
• Understanding the Go ecosystem
• Overview of the Go standard library
• Go modules and dependency management
• Anatomy of a Go application
• Hands-on: Examine and run a simple Go program

2. Setting Up the Go Development Environment

• Installing Go
• Understanding the Go toolchain
• Configuring environment variables
• Choosing an IDE or code editor
• Using the command line with Go
• Creating a Go workspace
• Understanding the Go project structure
• Initializing a project with Go Modules
• Using go mod init
• Managing dependencies with go get
• Updating and inspecting dependencies
• Formatting source code with gofmt
• Running programs with go run
• Building applications with go build
• Installing Go applications
• Cross-compiling applications
• Hands-on: Create and configure a Go project inside a container

3. Go Variables, Constants and Types

• Declaring variables
• Explicit versus inferred types
• Short variable declarations
• Constants
• Zero values
• Scope and lifetime of variables
• Primitive data types:
  • Integers
  • Floating-point numbers
  • Complex numbers
  • Booleans
  • Strings
• Type conversions
• Working with Unicode and UTF-8
• Runes and bytes
• Multiple variable assignment
• Understanding type safety
• Exercise: Build a small command-line data-processing program

4. Operators and Expressions

• Arithmetic operators
• Comparison operators
• Logical operators
• Assignment operators
• Increment and decrement
• Operator precedence
• Working with integer and floating-point calculations
• Avoiding common type-conversion errors
• Exercise: Implement calculations and validation logic

5. Dates, Times and Formatting

• Using the time package
• Creating and manipulating dates
• Getting the current time
• Time zones and locations
• Parsing dates and times
• Formatting dates and times
• Calculating durations
• Working with Unix timestamps
• Handling timeouts
• Exercise: Add timestamps and duration calculations to an application

6. Arrays, Slices, Maps and Structs

Arrays

• Declaring arrays
• Initializing arrays
• Iterating over arrays
• Multidimensional arrays

Slices

• Understanding slices versus arrays
• Creating slices
• Appending elements
• Copying slices
• Slice length and capacity
• Slicing slices
• Common slice pitfalls

Maps

• Creating maps
• Adding and removing entries
• Checking whether a key exists
• Iterating over maps
• Maps containing complex data

Structs

• Defining structures

• Struct fields

• Initializing structs

• Nested structs

• Anonymous structs

• Struct methods

• JSON struct tags

• Hands-on: Model users, products and application data using structs, slices and maps

7. Conditional Logic and Loops

• if statements
• else and else if
• Variable declarations within conditions
• for loops
• Infinite loops
• Loop conditions
• break and continue
• Iterating with range
• Nested loops
• switch statements
• Expression-based switches
• Multiple cases
• Default cases
• Type switches
• Exercise: Implement application validation and processing logic

8. Functions

• Defining functions
• Function parameters
• Return values
• Multiple return values
• Named return values
• Variadic functions
• Anonymous functions
• Function values
• Closures
• Recursion
• Passing functions as arguments
• Error-returning functions
• Designing small, reusable functions
• Exercise: Refactor existing code into reusable functions

9. Pointers and Memory Concepts

• What is a pointer?
• Address-of and dereference operators
• Pointers and function parameters
• Pointer receivers
• Pointers to structs
• Nil pointers
• When to use pointers
• Value versus reference semantics
• Understanding Go's memory management and garbage collection
• Common pointer mistakes
• Hands-on: Modify application data using pointers

10. Creating a Web Application in Go

• Overview of Go's web capabilities
• Introduction to the net/http package
• Creating an HTTP server
• HTTP requests and responses
• HTTP methods
• Request URLs and query parameters
• HTTP headers
• HTTP status codes
• Routing fundamentals
• Creating handlers
• Handling form data
• Serving static files
• Working with HTML templates
• Template variables and control structures
• Structuring a web application
• Hands-on: Build a basic Go web server

11. Building a RESTful Web Service

• REST architecture fundamentals
• Designing API endpoints
• GET, POST, PUT, PATCH and DELETE
• Working with JSON
• Encoding and decoding JSON
• Request validation
• HTTP status codes
• Error responses
• Query parameters and path parameters
• API response structures
• Separating handlers from business logic
• Hands-on: Build a CRUD REST API

12. Go Runtime, Compilation and Project Builds

• Understanding the Go compiler
• Go's build process
• go run
• go build
• go install
• go test
• Build flags
• Environment-specific configuration
• Building for different operating systems and architectures
• Producing standalone binaries
• Managing application configuration
• Exercise: Compile the application for multiple platforms

13. Working with Files and the Web

• Opening and closing files
• Reading files
• Writing files
• Creating directories
• File metadata
• Buffered I/O
• Working with streams
• Reading and writing JSON files
• HTTP clients
• Making outbound HTTP requests
• Handling HTTP client errors
• Timeouts and cancellation
• Processing API responses
• Hands-on: Retrieve data from an external API and persist it locally

14. Error Handling and Debugging

• Go's approach to errors
• Returning errors from functions
• Checking errors
• Creating custom errors
• Wrapping errors
• Adding context to errors
• errors.Is and errors.As
• Panic and recovery
• When to use panic
• Debugging common Go problems
• Logging application activity
• Using Go debugging tools
• Exercise: Diagnose and fix deliberately introduced application errors

15. Interfaces and Abstraction

• What is an interface?
• Implicit interface implementation
• Defining interfaces
• Interface values
• Empty interfaces / any
• Type assertions
• Type switches
• Pointer versus value implementations
• Designing small interfaces
• Dependency inversion
• Using interfaces for testing
• Reducing application coupling
• Hands-on: Introduce interfaces into the sample web application

16. Packages and Project Organization

• Creating packages
• Package naming conventions
• Exported and unexported identifiers
• Importing packages
• Package initialization
• Organizing application layers
• Internal packages
• Managing dependencies with Go Modules
• Semantic versioning
• Using third-party packages
• Avoiding circular dependencies
• Designing maintainable Go projects
• Exercise: Refactor the application into separate packages

17. Concurrency with Goroutines

• What is concurrency?
• Goroutines
• Starting goroutines
• Understanding lightweight concurrent execution
• Synchronization challenges
• Shared state
• Race conditions
• Using sync.WaitGroup
• Mutexes and read/write mutexes
• Atomic operations
• Hands-on: Convert a sequential task into concurrent processing

18. Channels

• Understanding channels
• Sending and receiving values
• Buffered versus unbuffered channels
• Blocking behavior
• Closing channels
• Ranging over channels
• Directional channels
• Channel-based communication
• Select statements
• Timeouts and cancellation
• Worker-pool patterns
• Producer/consumer patterns
• Hands-on: Build a concurrent worker system

19. Context and Request Management

• Why contexts are important in web applications
• context.Context
• Request-scoped context
• Cancellation
• Deadlines
• Timeouts
• Propagating context through application layers
• Cancelling database or HTTP operations
• Avoiding context misuse
• Exercise: Add request cancellation and timeouts to the web application

20. Testing Go Applications

• Why automated testing matters
• Writing unit tests
• The testing package
• Test functions
• Test naming conventions
• Table-driven tests
• Testing errors
• Testing HTTP handlers
• HTTP test servers
• Test fixtures
• Test coverage
• Benchmarks
• Example tests
• Testing interfaces with mocks or fakes
• Hands-on: Create a test suite for the sample application

21. Performance Optimization

• Understanding Go application performance
• Identifying bottlenecks
• CPU versus memory performance
• Efficient data structures
• Reducing unnecessary allocations
• Strings, bytes and buffers
• Goroutine management
• Avoiding excessive concurrency
• Caching strategies
• Database and network considerations
• Profiling applications
• Benchmarks and performance testing
• Using Go's profiling tools
• Exercise: Profile and optimize a deliberately inefficient application

22. Security and Robust Web Application Practices

• Validating user input
• Safe handling of HTTP requests
• Preventing common web vulnerabilities
• Secure error handling
• Authentication and authorization concepts
• Managing secrets and configuration
• Secure HTTP communication
• Avoiding sensitive information in logs
• Dependency management and updates
• Resource limits and request timeouts
• Exercise: Review and harden the sample API

23. Application Logging and Observability

• Logging fundamentals
• Structured logging
• Log levels
• Request logging
• Error logging
• Correlation and request IDs
• Monitoring application behavior
• Basic metrics
• Health-check endpoints
• Diagnosing production problems
• Hands-on: Add structured logging and health checks

24. Containerizing the Go Application

• Why use containers?
• Go applications and containerization
• Writing a Dockerfile
• Multi-stage builds
• Building a minimal runtime image
• Managing configuration through environment variables
• Container networking
• Exposing application ports
• Running the application in a container
• Testing the containerized application
• Hands-on: Package the sample Go application as a production-ready container

25. Deployment

• Preparing an application for production
• Building production binaries
• Environment configuration
• Container-based deployment
• Deployment architecture
• Reverse proxies
• HTTPS/TLS considerations
• Application health checks
• Graceful shutdown
• Handling operating-system signals
• Scaling Go web applications
• Horizontal versus vertical scaling
• Basic deployment troubleshooting
• Hands-on: Deploy the sample web application

26. Capstone: Complete Go Web Application

Participants bring the concepts together by developing a complete application.

The project can include:

• Project initialization with Go Modules
• Package organization
• HTTP routing
• REST API endpoints
• JSON request and response handling
• Input validation
• Error handling
• Interfaces
• Concurrent processing
• External API communication
• File or database persistence
• Automated tests
• Logging
• Performance considerations
• Containerization
• Production configuration
• Deployment

27. Review and Best Practices

• Review of core Go syntax
• Go coding conventions
• Writing idiomatic Go
• Keeping code simple
• Effective package design
• Error-handling best practices
• Interface design principles
• Concurrency best practices
• Testing strategies
• Performance considerations
• Maintainability and readability
• Common mistakes made by new Go developers
• Recommended approaches for continuing Go development

28. Conclusion

• Review of key concepts
• Review of the completed web application
• Questions and discussion
• Troubleshooting common real-world scenarios
• Recommended next steps for Go development
• Additional Go libraries and ecosystem resources
• Further opportunities for building production-grade Go services