恢复误删 Branch、Commit 与 Reset --hard 后的内容 | Git

本章覆盖：deleted branch；orphan commit；reflog；object id；create rescue branch；`fsck` 的高级定位；hard reset recovery limitations；untracked file cannot be restored by Git if never stored；garbage collection；backup importance；Git 很强，但不是所有数据都能救。