Checklists for software errors, setup, and tool workflows.

Fix Git 'index.lock file exists' Error

If you see fatal: Unable to create 'path/.git/index.lock': File exists. when...

Cloudflare DNS Not Propagating to All Nameservers: Common Fixes

You changed a DNS record in Cloudflare, but some resolvers still show the old value while others ...

Fix Docker Volume Permission Denied for Non-Root User

You run a Docker container as a non-root user and get a permission denied error when trying to wr...

Resolving Git Merge Conflicts in package-lock.json

If you work on a Node.js project with multiple contributors, you've likely seen a merge confl...

Fix 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...