Yes strumming lessons are in the fundamentals 1 section. Both Lisa and Anders and I'm sure Chris have a section on it. Lisa's is in chapter 7 and Anders does it a bit earlier in chapter 2. Are you following the fundamentals lessons? As you get into style courses or specific songs you'll learn even more strumming patterns but for now the fundamental courses should get you prepared. They both go over pick angles and wrist motion. 

hope that helps. 

Moe