Tools
References and quick-access pages I keep here because I got tired of re-finding them.
sysctl reference
The subset of sysctl knobs I actually use — BBR, file descriptor limits, kernel hardening. Annotated with what each one actually does.
Caddy Caddyfile cheatsheet
Common Caddyfile patterns: reverse proxy, file server, redirect, matcher syntax, environment variable interpolation.
openssl quick reference
The commands I use more than once a month: cert inspection, CSR generation, key pair creation, s_client tests.