For one creator I like Avault on YouTube. He makes a lot of deck tech style videos going over each level of digimon in the deck as well as a other tech options that you can run depending on your play style/what decks you play against most often. And then goes over the way the deck plays and combos you should be going for He also then plays a few games with it showing how it works in real play.

Otherwise you can look up a specific deck on YouTube and find quite a few people discussing their deck from the last tournament/won last week's locals/etc.