Git reset and revert

git reset [] []

This form resets the current branch head to  and possibly 
updates the index (resetting it to the tree of ) and the 
working tree depending on . If  is omitted, defaults 
to --mixed. The  must be one of the following:

soft

  Does not touch the index file or the working tree at all (but resets 
  the head to , just like all modes do). This leaves all your 
  changed files "Changes to be committed", as git status would put it.

hard

Resets the index and working tree. Any changes to tracked files in       
the working tree since  are discarded.

git revert

  Given one or more existing commits, revert the changes that the 
  related patches introduce, and record some new commits that 
  record them. This requires your working tree to be clean (no 
  modifications from the HEAD commit).


  Note: *git revert* is used to record some new commits to reverse     
  the effect of some earlier commits (often only a faulty one). If you 
  want to throw away all uncommitted changes in your working 
  directory, you should see [git-reset[1]](https://git-scm.com/docs/git-
  reset), particularly the `--hard` option. If you want to extract 
  specific files as they were in another commit, you should see [git-
  checkout[1]](https://git-scm.com/docs/git-checkout), specifically 
  the `git checkout  -- ` syntax. Take care with 
  these alternatives as both will discard uncommitted changes in 
  your working directory.