Checklists for software errors, setup, and tool workflows.

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Fix Cloudflare 521 Error Due to Server Overload

You see a Cloudflare 521 error page. The message says the web server is down. Often, this means y...

Fix net::ERR_CERT_AUTHORITY_INVALID on Chrome in Linux Terminal

When you see net::ERR_CERT_AUTHORITY_INVALID in Chrome on Linux, it usually means th...

Fix Docker Permission Denied Errors on Ubuntu

You start a Docker container with a mounted volume, and get a permission denied error when the co...

Fixing Node Sass Build Failures on Linux

If you're running npm install on a Linux machine and get a build failure for

Fix Git SSL Certificate Problem with Proxy: Unable to Get Local Issuer

When you see fatal: unable to access 'https://...': SSL certificate problem: unable...

Fix Git SSL Certificate Problem on Windows: Unable to Get Local Issuer
If you see fatal: unable to access 'https://...': SSL certificate problem: unable t...