Actually I'd use 30 deg AOB on base to final - as I was taught a while ago now. Now on climb out on turn to crosswind, I'd limit my turn to 20 deg, maybe less.
Yes that is what I was taught.
I do crosswinds using the wing down method.
I use whatever feels right - it's probably the crab method with final rudder "kick" but I want to practice the wing down method a bit more.
In the Cessna crosswinds up to 10 knots are not that big a deal. That's my limit anyway.