Discord has proven to be an excellent way to network, meet and talk with other Hive users "off-chain". Many casually check in and out of Discord groups and it seems to be almost its own ecosystem on its self. It is where many curators find posts, or to vote on posts. And hanging around in many of these discords can get you noticed. They are also a great place for support, such as groups like "The Terminal" where new users can find mentorship and help find out the proper way to conduct yourself on Hive.
Other groups are more known as "wild west cowboy bars" you may want to turn back and leave upon entering... lol Though I find those groups the most fun honestly.
Some even do interactive shows such as DreemPort, and #PYPT (Pimp Your Post Thursdays) hosted by @shadowspub where you can show off your posts to a group of Discord Hive users, if you post is good they may upvote or comment on it. You can also just listen in and curate and comment on posts you like that are presented.
There are some private groups such as Canna-Curate which serves as an excellent place to ask for growing advise, a strong group of growers hang out in there and really thankful to have every single one of them there.
Some groups such as Original Content Decentralized (OCD) have level up abilities, the more you post there the higher level Pokemon your Discord avatar becomes.. A fun idea.
Other groups such as HiveWatchers, going there may be due to having a downvote on your account and deal with it in the appeals area. But observing the interactions there and comments I have found out many things and I think just lurking you can learn much. Hopefully you do not find yourself in the timeout area.
The Official Hive discord is great when you have having troubles doing stuff on Hive, posting or having access issues.. Many smart people hang out there and can get you along you way. They will even give you basic advise on how to start up a Hive witness.
Places like Peace Abundance and Liberty (PAL) used to be very active a few years back, there was a whole roster of Hive users that would do live streams at different times of the day. You could find a show just about every day on there, but now they have closed their doors to such things.
Many other groups exist, so if I forgot to mention any please leave them in the comments. Pick up to five groups.
My goal from this post to find out which groups people find the most useful, spend the most time in and would suggest to others. 5 votes can be cast by each person as I figured some may not have a single choice in these groups. I like many myself.
If you cannot vote (not using peakd) please leave a comment with your favorite discord(s).