Go practice

Go the way the language is actually designed — small surface, deep consequences. Slices versus arrays (headers, backing arrays, append’s reallocation surprise), maps and zero values, strings, runes and bytes, structs and methods (pointer vs value receivers), interfaces (implicit satisfaction, the nil-interface trap), goroutines and channels (buffered vs unbuffered, select, closing rules), sync primitives and the race detector’s lessons, defer/panic/recover (defer’s argument evaluation, LIFO order), error handling idioms (wrapping, errors.Is/As), generics, packages and visibility, and the standard toolchain. Predict-the-output items expose the classic gotchas; every explanation names the mechanism, the trap, and a rule. Authored from the official Go documentation and specification at the current stable release.