Definitely the Lazarus Forum as others have noted. In my opinion, it's a really delightful time capsule of how internet communities used to be before Facebook/Reddit. Insanely helpful and knowledgeable members that will answer any question, a bunch of eccentric characters, plenty of n00bs asking mundane questions, and the compiler developers themselves. Probably my favorite language ecosystem.
https://forum.lazarus.freepascal.org/index.php