Build a Real CLI Tool in Go

Build til, a note-taking CLI in Go - subcommands, flags, safe JSON storage on disk, aligned table output, real tests, and cross-compiled binaries you can put on your PATH.

1. Why Go, and a Compiling Project Create the til module with go mod init, read command-line arguments from os.Args, and compile your first self-contained binary with go build.
2. Flags and the add Command Dispatch subcommands from os.Args, give each one its own flags with flag.NewFlagSet, and build the add command that parses tags and note text.
3. JSON on Disk, Safely Persist notes to ~/.til/notes.json with encoding/json - struct tags, a missing file treated as a first run, and atomic writes so a crash can't corrupt the store.
4. list, search, and tags Finish the subcommand set - list with -n and -tag flags, case-insensitive search, a tags summary - and align it all into clean tables with text/tabwriter.
5. Tests That Catch Real Bugs Write table-driven tests for the search and filter logic, round-trip the JSON storage through t.TempDir, and watch go test catch a planted bug.
6. Cross-Compile and Ship It Build til for Windows, macOS, and Linux from one machine with GOOS/GOARCH, install it on your PATH with go install, and map the honest next steps.