Checklists for software errors, setup, and tool workflows.

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Latest checklists

You've made several edits, then checked out an old commit or tag, and now Git says you're...

If you're seeing error: externally-managed-environment when trying to pip ...

Fix Nginx 502 Bad Gateway: Upstream Connection Refused
If you're seeing a 502 Bad Gateway error with "upstream connection refused" in your N...

Fix Nginx Configuration Test Failure After SSL Setup
You've just added SSL certificates to your Nginx server block, but nginx -t retu...

Fix Windows Explorer Restarting After Crash
If Windows Explorer (explorer.exe) crashes and then keeps restarting, you may see the desktop fla...

Fix 'git pull failed index.lock file exists' Error
When running git pull, you may see an error like:
fatal: Unable to create &#...