I think this is going to revive the debate but with my instructors cap on, What I suggest is to rudder slightly into the wind to keep your ground track. Your trainer will have a roll couple so you will want to counter that with opposite aileron. As you get into ground effect you can ease off to get the gear going strait down the runway. Going to Youtube and searching " landing in a crosswind " will be very informative.
So you recommend that a beginner land in a crosswind by slipping, with the ailerons set to hold the
downwind wing lower? There are two things wrong with that. First, it's a lot easier to crab. Just turn the plane into the wind a little, then stop turning and and keep it heading that way. See Post 140. No need for cross control. Second, if for some reason you do want to handle the crosswind by slipping, lower the wing
on the side from which the wind is blowing, and keep the fuselage straight by using a bit of rudder
away from the wind, not toward it. It's hard to get that right, especially with a model, but it's a useful skill to learn, as slipping is how you lose a lot of altitude in a hurry when you need to. But keep your airspeed up, as your stall speed in a slip is higher.
Someday, if you want to become a pattern flyer, you will do things differently because you will lose points if your wings aren't level. For ordinary flying, keeping the wings level all the time is just wrong. We got into this discussion in the first place because of a silly video recommending that. Don't do it.