Nginx

Initial Server Setup with Ubuntu 20.04

Initial Server Setup with Ubuntu 20.04 | DigitalOcean

How To Install Nginx on Ubuntu 20.04

How To Install Nginx on Ubuntu 20.04 | DigitalOcean

Nginx is one of the most popular web servers in the world and is responsible for hosting some of the largest and highest-traffic sites on the internet.
https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-20-04

How To Secure Nginx with Let’s Encrypt on Ubuntu 20.04

How To Secure Nginx with Let's Encrypt on Ubuntu 20.04 | DigitalOcean

Let’s Encrypt is a Certificate Authority (CA) that provides an easy way to obtain and install free TLS/SSL certificates, thereby enabling encrypted HTTPS on …
https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-20-04

DNS

Domains and DNS

Domains and DNS|DigitalOcean Documentation

Manage DNS for Droplets, DigitalOcean Load Balancers, and non-DigitalOcean resources all in the same place.
https://docs.digitalocean.com/products/networking/dns/

Others

Building an API Gateway to Get Out of the Monoliths

Building an API Gateway to Get Out of the Monoliths | DigitalOcean

Why and how DigitalOcean built an API gateway that scales to dozens of microservices while still keeping its monoliths alive.
https://www.digitalocean.com/community/tech-talks/building-an-api-gateway-to-get-out-of-the-monoliths

Firewall

Basic UFW commands

Basic UFW (Uncomplicated Firewall) commands

The default firewall configuration tool for Ubuntu is ufw.
https://serverspace.io/support/help/basic-commands-ufw/