Common operations of sourcetree version management

1. File status
   Different colors indicate different states of the file
   
2. Discard UN staged files , Right click on a file that is not staged , Select discard .
   
3. You cannot have an unstarted file before submitting
4. How to view a previous version or go back to a previous version
   Select the corresponding version, double-click or check out to make the workspace jump to the version
   Select the corresponding version, right-click and select reset branch to this submission to rollback the version （ Forced merge is often used + Soft merger Reference resources SourceTree Rollback of SourceTree Soft merge of 、 Mix and merge 、 Strong merge differentiates ）