crabfsage78TF2 had rocket jumps as a feature of the game since the beta trailers and they havent added a single tutorial about it! just small mentions on loading screensdidn't the actual tutorial for soldier make you have to rocketjump over some tall thing to get past it
it's been years since i did it but i'm pretty sure they tell you how to do the most basic rocketjump
its just movement keys, shooting range and switching weapons as far as i remember
i love how they explain basic logic like how the blast of the rockets can hit multiple enemies at once