git reset command
We can use git reset command to remove the commits from the branch.
Syntax git reset <option> <commit-hash>
 The git reset has three optionss: 
 a) --soft: reset only HEAD 
Syntax git reset --soft <commit-hash>
 b) --mixed (default behavior): reset HEAD and index  Syntax  git reset <commit-hash> 
 or 
 git reset --mixed <commit-hash> 
The above command will remove the commits in front of specified hash.
Note: The changes in the files are not reset to that commit, only the commit history is wipe out upto that commit.
 c) --hard: reset HEAD, index and working tree 
 If we want to undo both the commits AND the actual changes in our files, we can use the --hard option. 
 For example, git reset --hard HEAD~1 will delete the last commit and associated changes. Be cautious when using this option as it permanently discards uncommitted changes. 
Syntax git reset –hard <commit-hash>