Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're trying to push a commit that includes a large file—maybe a dataset, a binary, or a gen...

You run git push and get: ! [rejected] main -> main (non-fast-forward)

Fix Nginx 502 Bad Gateway: Upstream Connection Refused
If you're seeing a 502 Bad Gateway error with "upstream connection refused" in your N...

Fix pnpm ERR_PNPM_NO_OFFLINE_META: Step-by-Step Guide
You run pnpm install and see ERR_PNPM_NO_OFFLINE_META. This usually hap...

Fix Nginx Permission Denied Error for www-data User
If you see errors like nginx: [emerg] open() "/var/www/html/index.html" failed (13:...

Fix Git Clone Connection Timed Out on AWS CodeCommit
If you're seeing git clone connection timed out when trying to clone a repositor...