Checklists for software errors, setup, and tool workflows.

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Latest checklists

If you see “fatal: remote origin already exists” when trying to git remote add origin

Fix 'Permission Denied' When Running pip install --user
If you see Permission denied when running pip install --user somepackage

Fix Git Push Rejected: Non-Fast-Forward Error
You try to push your local commits to a remote Git repository, but Git refuses with: ! [rej...

Fix Git Stash Error: index.lock File Exists
You run git stash and see: fatal: Unable to create 'path/.git/index.lock&#...

Git Merge Conflict Checklist Before Merging
You're about to merge a branch, but you've been burned by merge conflicts before. This ch...

Fix Firefox Secure Connection Failed on Windows 10
You're browsing in Firefox on Windows 10 and get a full-page error: Secure Connection Fai...