Here at 1676, we spend a few weeks teaching the newcomers what they are interested in. When the rookies sign up for the team (give name, email, etc.), they state the top 3 subteams they are interested in learning. During the pre-season, a veteran (who is the leader of said subteam), will teach the rookies what that particular subteam is all about.
Our chassis subteam leader ran through the basics of a chassis, and helped the rookie construct a basic chassis.
Our electrical subteam leader taught how to build an electrical board. They drew out diagrams on a whiteboard, which explained the basics of electrical.
The list goes on and on...
I would recommend hands-on experience rather than reading a book or doing online activities. With hands-on experience, the rookies will have a pretty good idea of whats going on when build season comes around.
Hope this helps!
