⚠️ WARNING: "My last X commits" might be ambiguous.

  (MASTER)  
Fleetwood Mac            Fritz
      ║                    ║
  Add Danny  Lindsey     Stevie       
    Kirwan  Buckingham    Nicks                                              
      ║         ╚═══╦══════╝     
Add Christine       ║          
   Perfect      Buckingham
      ║           Nicks            
    LA1974══════════╝                                    
      ║                  
      ║                  
    Bill <══════ YOU ARE EDITING HERE
  Clinton        (CHECKED OUT, CURRENT WORKING DIRECTORY)              
                        

In this very abbreviated history of the https://github.com/fleetwood-mac repository you have opened a pull request to merge in the the Bill Clinton commit into the original (MASTER) Fleetwoodd Mac commit.

You opened a pull request and on GitHub you see this:

Four commits:

• Add Danny Kirwan
• Add Christine Perfect
• LA1974
• Bill Clinton

Thinking that nobody would ever care to read the full repository history. (There actually is a repository, click the link above!) You decide to squash the these commits. So you go and run git reset --soft HEAD~4 && git commit. Then you git push --force it onto GitHub to clean up your PR.

And what happens? You just made single commit that get from Fritz to Bill Clinton. Because you forget that yesterday you were working on the Buckingham Nicks version of this project. And git log doesn't match what you see on GitHub.

🐻 MORAL OF THE STORY

1. Find the exact files you want, and git checkout them
2. Find the exact prior commit you want to keep in history, and git reset --soft that
3. Make a git commit that warps directly from the from to the to