I've gotten back into NH recently and it's been awesome. Really a timeless game. Remember to have a look at tweaking some options (https://nethackwiki.com/wiki/Options) - "O" is a much better boulder than "`". Also, #hardfought on Libera.Chat is really active and is a great place to get advice. When you get tired of NetHack you can try out EvilHack (https://nethackwiki.com/wiki/Evilhack)