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40+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes os open create readfile, defer close pattern, bufio scanner and writer, io reader writer interfaces, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Learn Go I/O as a set of precise, composable contracts: open files with intentional flags and permissions; choose whole-file or streaming work from real size bounds; close resources at the right scope; scan and buffer without losing errors; implement Reader and Writer count rules; copy streams with limits and fast paths; construct portable paths with a real containment boundary; and load typed configuration without unsafe process-global test state. Each lesson includes a runnable example and focuses on the failure modes that matter in production.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–40 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–40 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q40.