Character creation: various ways board games let players build their own characters (video):

https://www.youtube.com/watch?v=bSMzZUJ4RNE

Considering games through the lens of economics and how that can shed light on what makes a decision interesting (video):

https://www.youtube.com/watch?v=rLcqQmCZ2f8

An overview of the board game design process: prototyping, deciding on mechanics, finding playtesters, and more (video):

https://www.youtube.com/watch?v=P6F9yfYGWz4&t=17s

A look at action timers as a game mechanic: how they affect the play experience, games where they work well, and the kinds of players that might enjoy them (video):

https://www.youtube.com/watch?v=y8LwUeOFigY