Avalanche Basics (Ortovox)
Emergency avalanche (Alpenverein Österreich)
There are also: Proper probing, Proper shoveling
The ÖAV has lots of good instructional videos on all kinds of topics: Kanal Alpenverein Österreich
Lecture Avalanche Update 2019/20 by Michael Larcher (ÖAV)
Right casual: Know Before You Go
American Avalanche Characters
In North America, avalanche problems are broken down more finely and also more strongly attributed to the three avalanche types (slab avalanche, sliding snow avalanche, loose snow avalanche). Here is a list of all their avalanche problems.
Introduction to avalanche danger levels
The American definition of danger levels differs slightly from the European one, but for the user this makes no difference. Great video with easy-to-follow illustrations.