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

Clear Chrome Certificate Cache to Fix NET::ERR_CERT_AUTHORITY_INVALID

When you see NET::ERR_CERT_AUTHORITY_INVALID in Chrome, it usually means the browser...

Fix git index.lock File Exists Error on Windows

If you see fatal: Unable to create 'index.lock': File exists. when running G...

Fix Cloudflare 521 Error Due to Server Overload

You see a Cloudflare 521 error page. The message says the web server is down. Often, this means y...

Fix 'Python Command Not Found' in Anaconda on Windows

How to Fix Chrome Sync Not Working with Multiple Profiles

If you use multiple Chrome profiles—say, one for work and one for personal—sync can sometimes sto...

Python UnicodeDecodeError When Opening Files: How to Fix

You try to open a text file in Python and get UnicodeDecodeError: 'charmap' codec c...