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...

How to Fix Git 'index.lock' File Exists Error

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

Fix Git SSL Certificate Problem: Unable to Get Local Issuer

You run git clone https://example.com/repo.git and get:

fatal: unable to acc...

Git Push Rejected Non Fast Forward: Troubleshooting Checklist

If you see ! [rejected] main -> main (non-fast-forward) when running

Setting Timeouts on Python Requests GET: A Practical Guide

When your Python script makes a GET request and the server is slow or unresponsive, the script ca...

Fix Nginx Configuration Test Failure from Rewrite Rules

You run nginx -t and get an error. The log points to a rewrite rule. This is common ...