This Rookie series of tutorials is for new users of iMovie 10.2.3. It will quickly get you started and help you to understand how to easily create videos on your Mac.
The videos use my years of editing and teaching experience to cover just the items you need to know, without going into unnecessary details that will bog you down.
Getting Started with iMovie: https://youtu.be/MRXd4J-enp8
Lesson 2. Trim in the Timeline: https://youtu.be/bAVR_z3Fsxc
Lesson 3 Audio: https://youtu.be/uSg_BC0chcQ
Lesson 4 The Tool Bar: https://youtu.be/CGHBr_oUfCI
Lesson 5 iMovie Trailers: https://youtu.be/DeZnZuFbXyA