Go

roadmap.sh: https://roadmap.sh/golang

Suggested path through the Go nodes. Each node links to its lesson when written.

Nodes

Introduction

• What is Go
• Why Go (Simplicity / Concurrency)
• Installing Go
• Go Toolchain (go command)
• Hello World
• go run / go build / go install
• GOROOT / GOPATH / Go Modules

Basics / Syntax

• Variables & :=
• Constants & iota
• Basic Types
• Zero Values
• Type Conversions
• Operators
• Control Flow (if / for / switch)
• defer
• Comments

Functions

• Declaring Functions
• Multiple Return Values
• Named Return Values
• Variadic Functions
• Closures & Anonymous Functions
• First-Class Functions
• defer, panic, recover

Data Structures

• Arrays
• Slices
• Slice Internals (len / cap)
• Maps
• Structs
• Anonymous Structs
• Struct Embedding
• Pointers

Methods & Interfaces

• Methods
• Pointer vs Value Receivers
• Interfaces
• Empty Interface / any
• Type Assertions
• Type Switches
• Interface Composition
• Stringer & Common Interfaces

Generics

• Type Parameters
• Constraints
• comparable & constraints Package
• Generic Functions & Types

Error Handling

• The error Interface
• Creating Errors (errors.New, fmt.Errorf)
• Error Wrapping (%w)
• errors.Is / errors.As
• Custom Error Types
• Sentinel Errors

Concurrency

• Goroutines
• Channels
• Buffered Channels
• select
• sync.WaitGroup
• sync.Mutex / RWMutex
• sync.Once
• context Package
• Worker Pools
• Race Detector

Packages & Modules

• Packages
• Imports
• Exported vs Unexported
• Go Modules (go.mod / go.sum)
• go get & Versioning
• Workspaces (go.work)
• init Functions

Standard Library

• fmt
• strings / strconv
• os / io
• bufio
• time
• encoding/json
• net/http
• sort
• regexp
• log / log/slog

Testing & Tooling

• testing Package
• Table-Driven Tests
• Benchmarks
• go test & Coverage
• Fuzzing
• go fmt / gofmt
• go vet
• golangci-lint
• pprof Profiling
• Delve Debugger

Web & Beyond

• Building HTTP Servers
• Routing & Middleware
• Web Frameworks (Gin / Echo / Chi)
• Database Access (database/sql)
• ORMs (GORM / sqlc)
• gRPC & Protobuf
• Cross-Compilation

Resources

See resources.md.

Project ideas

• Harden the existing playgrounds/go/worker-pool into a generic, context-cancellable pool: add a context.Context for graceful shutdown, error aggregation, and a benchmark plus race-detector run (go test -race).
• Add a playgrounds/go/url-shortener HTTP service using only net/http and encoding/json (in-memory map + sync.RWMutex), then layer table-driven handler tests over it.
• Generalize playgrounds/go/binary-search into a generic func BinarySearch[T cmp.Ordered](…) using type parameters, with a fuzz test (go test -fuzz) to find edge cases.