Checklists for software errors, setup, and tool workflows.

Fix Cloudflare Origin Certificate with Let's Encrypt

If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...

How to Enable Breakpoints in VS Code

If you've set a breakpoint in Visual Studio Code and it's not being hit, or you're no...

Fix Error 0x80070080: Windows Update Reset Permissions

Error 0x80070080 (access denied) during Windows Update usually means the system lacks proper perm...

Fix 'git pull failed index.lock file exists' Error

When running git pull, you may see an error like:

fatal: Unable to create &#...

How to Check Docker Disk Space Usage

If you run Docker for a while, you may notice your disk space shrinking. Images, containers, volu...

Fix Nginx 'Permission Denied' Upstream Errors

When Nginx logs permission denied while connecting to an upstream (e.g., a Unix sock...