Checklists for software errors, setup, and tool workflows.

Fix 'git pull failed index.lock file exists' Error

When running git pull, you may see an error like:

fatal: Unable to create &#...

Windows Security App Not Opening: Practical Fixes

If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...

Chrome Sync Not Working on Windows 10: Quick Fixes

You open Chrome on your Windows 10 PC, expecting your bookmarks and passwords to be there, but no...

Fix DNS Probe Finished NXDOMAIN Not Working on WiFi

If you see "DNS_PROBE_FINISHED_NXDOMAIN" in Chrome while connected to WiFi, your browser ...

Fix Python venv Not Activating in VS Code Terminal

When you create a Python virtual environment but it doesn't activate in the VS Code terminal,...

Fix Git Push Rejected Non-Fast-Forward After Pull

You run git pull, then git push, and get: ! [rejected] non-fast-f...