Getting good at ollies is easy, actually.

Skate IQ coach Mitchie Brusco works with beginner and intermediate skaters on ollies, with drills for pop, slide and clearing small obstacles. Runs about 50 minutes with chapters for each skill level.

Why skaters like it

Linked in r/NewSkaters as an excellent ollie instructional, and sent to people asking why their ollies look off or what they are doing wrong.