selfhosting 
Protecting My Server with Fail2ban
How I set up Fail2ban on my server to stop brute force attacks, SSH hammering and Nginx abuse with the actual config I use.
Nginx 101: how it actually works (from a newbie's perspective)
A ground-up explanation of nginx config files, server blocks, reverse proxying, SSL, and everything in between. Written after spending way too long debugging sites-enabled.