Checklists for software errors, setup, and tool workflows.

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Fix Git 'index.lock' File Exists Error in IntelliJ

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

Git Fatal: Refusing to Merge Unrelated Histories – Workaround
You try to merge two Git branches and get this error:
fatal: refusing to merge unre...

Fix Docker Build Fails: No Space Left on Device
You run docker build and it fails with no space left on device. This is...

VS Code IntelliSense Not Working for Java: Fix Guide
You open a Java file in VS Code, start typing, and get no code completion, no parameter hints, no...

Python Virtual Environment Not Activating on Mac: Fixes
You open Terminal, run source venv/bin/activate, and nothing happens—or you get an e...

Fix 'git remote add origin already exists' Error
When you run git remote add origin <url> and see fatal: remote origin al...

Checklists for software errors, setup, and tool workflows.

Latest checklists

Fix Git 'index.lock' File Exists Error in IntelliJ

Git Fatal: Refusing to Merge Unrelated Histories – Workaround

Fix Docker Build Fails: No Space Left on Device

VS Code IntelliSense Not Working for Java: Fix Guide

Python Virtual Environment Not Activating on Mac: Fixes

Fix 'git remote add origin already exists' Error

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