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 &#...

How to Fix Firefox Secure Connection Failed with VPN

You're using a VPN and Firefox suddenly shows 'Secure Connection Failed' on sites tha...

Chrome Memory Not Decreasing After Closing Tabs – Fixes

You close a dozen tabs, but Chrome still eats 2 GB of RAM. This is normal up to a point—Chrome ca...

Fix Windows Update Error 0x80070002 on Windows 11

If you see error 0x80070002 when running Windows Update on Windows 11, it usually means Windows c...

Windows Defender Real-Time Protection Greyed Out: How to Fix

If you open Windows Security and see the real-time protection toggle greyed out, you can't tu...

Fix 'No Space Left on Device' with Docker Devicemapper

If you're running Docker with the devicemapper storage driver and see no s...