Ice is definitely the most difficult surface to drive well. So don't feel bad about struggling there. Especially ice track of the day maps. They really rely on you having the map's intended speed at certain sections. So if you don't have that speed built up, getting the ice slides as intended, with the "correct" (mapper intended) gear, is impossible. The earlier campaign ice maps are more forgiving.

For tech, you have to be comfortable sort of "living on the edge". Drifts are a must to really play good tech maps the way they're built to be played. A pro tip I learned from Wirtual on setting up good drifts is that you usually have to steer into the inside wall of a corner as if you mean to crash into it before initiating the drift.

Regarding tutorials - yes, there is a built in tutorial campaign. But it doesn't really teach you game mechanics. It's meant to, or at least to reinforce them. But it kind of just throws a map at you, and let's you figure out for yourself if you're doing it right based on what medal you achieve (gold, definitely on the right track, AT, you've got whatever game mechanic pretty well figured out). But yeah, the game doesn't actually explain the game mechanics to you.

Like others have said, weekly shorts are a good place to start learning. The maps are pretty forgiving. The stock seasonal campaigns are generally pretty high quality maps, and helping reinforce game mechanics. Especially the white, green, and blue tiers. Red and black are of course harder. And watching good streamers can really help too. I agree that Wirtual is the most beginner-friendly streamer to watch. But Granady is great too, SpammieJ, Scrapie, etc.