Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see ! [rejected] and non-fast-forward when running git pus...

Fix VS Code Breakpoints Not Hitting in WSL
If you're debugging a project in WSL and VS Code breakpoints aren't being hit, you're...

Fix Git 'index.lock' File Exists Error on Linux
When working with Git on Linux, you might see an error like:
fatal: Unable to creat...

Fix npm run build Failed with PostCSS Error
You run npm run build and see a PostCSS error. This often happens after updating pac...

How to Manually Activate a Python Virtual Environment
You've created a Python virtual environment but can't get it to activate. This guide walk...

Fix Cloudflare Wildcard Subdomain Not Working
If you've set up a wildcard DNS record in Cloudflare (e.g., *.example.com) but s...