Assuming you are asking about
https://Brandmeister.network talkgroups and want to chat anytime: 91, 310-319, 3100, 98003 (the Reddit TG), your state's statewide and (if one exists) a regional (covering perhaps a section of a state or surrounding states) TG. You can get a full list of BM talkgroups from
Talkgroups | BrandMeister using the CSV button (or buttons for other formats) atop the page.
I
strongly recommend you read (and bookmark)
Amateur radio notes by KE0FHS as it is by far and away the best DMR resource on the web. KE0FHS has done a magnificent job on this document.
The Colorado HD net on TG 31088 Friday evenings at 7:30 Mountain time is probably the best net to discuss all things digital. In part 2 of the net you can ask questions. Net procedure to be recognized is different than most, using a keypress rather than voice; listen to the preamble for instructions. More on Colorado HD and the net:
Colorado Digital Multiprotocol System
And you'll need 4000 to Unlink.
HTH.