$ git help 
$ git help 
$ git reset -- /** remove ADD*/
$ git reset --soft/hard  /** reset COMMIT: preserve changes/ dischard changes */    
$ git checkout -- /** DISCARD changes */
$ git checkout  /** Jump between commits */
$ git checkout  --  /** Revert file to previous commit */
$ git merge --abort /** cancel MERGE */
$ git reset --hard HEAD^ /** Git reset to choosedcommit **/