Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see an error like fatal: Unable to create 'project/.git/index.lock': File ex...

Git Merge Conflict Checklist Before Merging
You're about to merge a branch, but you've been burned by merge conflicts before. This ch...

Fix npm run build Failed Due to Webpack Configuration
When npm run build fails, the error often points to a webpack configuration issue. T...

Docker System DF Shows No Space Left: Fixes & Checks
When you run docker system df and see no space left on device, your Doc...

Docker Build Context Canceled: Checklist and Fixes
You run docker build and see context canceled before the build finishes...

How to Fix Node Version Mismatch in a Project
You cloned a project, ran npm install, and got errors about engine incompatibility. ...