If your team is using Onshape for CAD I reccomend checking out their built in learning center and if your team is not using Onshape for CAD I’d consider switching over. They have some nice self paced courses and even courses made for FRC.
If you have students that are brand new to programming I reccomend trying out the University of Helsinki’s free programming course
1678 also publishes a great set of workshops every year that cover all kinds of topics
Spectrum also has a great video about design organization along with many other helpful videos
I’d also highly reccomend checking out some Open Alliance build logs from both this year and previous years. Some of my favorites from this year: