Somnolence
If you're interested in DCG, I would recommend these videos for the rules. The first goes over the main rules of the game, while the other two cover the two new mechanics added afterwards. They're all pretty short, sub 7 minutes. The only things I would add are
(1) No effects can be activated or look into the breeding area unless they specifically say so (Check ProtoGizmon BT13-080 or Greymon EX9-009 for examples)
(2) You can only have 4 copies of the same serial number in the deck, but any number of that name (4 copies of Greymon EX9-009, 4 copies of Greymon BT12-062, etc)
(3) BT sets are main sets and EX sets are side sets. Not much of a difference between them
(4) There's a very big discord server called "Digimon TCG 2020" that I would highly recommend. Massive population, practically 24h judge chat, and a chat for every single deck out there (though, you might have to ask to find a thread for you deck since they have goofy names sometimes)
Sorry if I've derailed this thread. I'll try and make a digimon thread tomorrow
Also, try looking up CardProtagonist or Rustmarrow on youtube if you want to see some sample duels. They both explain their card effects in full which I found super duper helpful as a newcomer. Rustmarrow gives some really detailed explanations, but his channel's kinda sporadic with activity (which shouldn't matter too much if you just wanna see some sample duels)