Knowledge base for software setup, errors, and daily tool work.

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...

Docker Container Exits Immediately with Exit Code 137

You start a Docker container, and it exits almost immediately with exit code 137. This usually me...

Fix Python Permission Denied When Installing Package via Docker

Fix Windows 11 Blue Screen After Update Using DISM

After a Windows 11 update, some users encounter a blue screen of death (BSOD) on boot. This often...

How to Fix Cloudflare 521 Error with Firewall Settings

If you see a 521 Web Server Is Down error when visiting your site through Cloudf...

Fix Python Permission Denied When Installing Virtualenv with Pip

When you run pip install virtualenv and see a Permission denied err...