Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you see the error fatal: Unable to create 'path/.git/index.lock': File exists....

Fix ERR_CONNECTION_RESET on Specific Websites
ERR_CONNECTION_RESET is a common Chrome error that prevents loading certain websites while others...

Fixing NGINX Upstream Connection Refused SSL Errors
When NGINX logs upstream connection refused for an SSL backend, it usually means the...

Fixing Node.js Heap Out of Memory on Windows
If you see a FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of me...

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...

How to Downgrade Node.js for Package Compatibility
You install a package and get errors like requires Node.js >= 16, but you have 18...