Multiplying two matrices represents applying one transformation after another. Many facts about matrix multiplication become much clearer once you digest this fact.
Future series like this are funded by the community, through Patreon, where supporters get early access as the series is being produced.
3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with YouTube, if you want to stay posted about new videos, subscribe, and click the bell to receive notifications (if you’re into that).
If you are new to this channel and want to see more, a good place to start is this playlist: