Numbers calculation functions

I have searched and watched numerous tutorials on how to use Numbers calculations functions, but I still can't get the functions to work. The vids I've seen often seem to reference commands that don't seem available to me. Perhaps it's that we're using different versions, but the vids don't say which version they are using. I'm using Numbers 11.1(7031.0.102) on a MacBookAir M1 2020 Using OSX 12.4 Monterey. I'm in Spain.

My question: can anyone point me in the direction of the best tutorial to help me start using Numbers? I like the look of it and really don't want to have to use Excel for Mac.