RFC 1925: The Twelve Networking Truths

When you're knee deep into solving a problem in your homelab, or you're simply disillusioned with everything - give this a read..

"This memo documents the fundamental truths of networking for the Internet community. This memo does not specify a standard, except in the sense that all standards must implicitly follow the fundamental truths."

https://www.rfc-editor.org/info/rfc1925/