I want to git gud at nftables, but the official wiki and every tutorial out there expects you to be an expert in the legacy Linux utility, iptables. :meow-tableflip:
Edit: Also lots of web fine web tools and APIs with outdated or miserable docs. No excuse. Good documentation may unironically be my passion.
That's exactly why I suggest "identifying what [you] want to do" and learn how that works on a networking level, in this case you want to set up firewalls. Then learn the tool, figure out what each command does from the Man pages, play around, test it out, etc.