git

• what's difference between git revert and git reset.

都是撤销修改记录，其中，reset 是取消一个提交；revert 是修改内容然后生成一个新的提交。必须指出的是：reset 在远程不生效，如果需要撤销远程的提交，需要使用 revert.

• git cherry-pick and interactive git rebase

当你需要整理提交记录的时候(即让某些想要的提交记录形成提交链.)或者只需要指定的几个提交记录时, 就可以用 git cherry-pick and git rebase. interactive git rebase means git rebase -i

• rebase --interactive

对提交记录自由重新排序. 主要用于合并分支的时候

• cherry-pick

可以获取任何节点，除了当前分支及当前分支的父节点以外。然后加到当前节点下。比如"拾取需要的节点合并到主分支"https://oschina.gitee.io/learn-git-branching/.

• git Tag

这个对我来说是重点，因为以前从来没了解过.
tag 可以锚定一个提交，并且在不主动删除的情况下永远引用它.(与分支相对应的是分支可以修改、提交、移动) git tag -h to read usage.

• what is the difference between HEAD, index and working tree.
  1. HEAD, A reference that reference to branch or some commit. It means where are you in currently.
  2. index, or staging area. Here is where something prepare to commit and compares the files in working tree and files in the repository.
  3. working tree, It is you are working place, you can assume it as file system where you can view and changes file.

-- git reset

reset the current HEAD to the specified state.

The form git reset [-q] [<tree-ish>] [--] <pathspec> means that git reset <pathspec> is the opposite of git add <pathspec>

• some standard behaviors

  1. using git fetch intead of git pull, and you can choose neither git merge or git rebase

• git log show what changed.

git log --raw