git commit：创建不可变版本节点 | Git
本章覆盖：`git commit`；staged snapshot；commit object；tree；parent；author；committer；commit message；current branch ref moves forward；commit 不是 remote upload；一个 commit 应表达一个可解释的逻辑变化。
本章知识点
git commit- staged snapshot
- commit object
- tree
- parent
- author
- committer
- commit message
- current branch ref moves forward
- commit 不是 remote upload
- 一个 commit 应表达一个可解释的逻辑变化