Auction games: what they are, how they work, different variations, and some well-known examples of the genre (video, starting at 21:30):

https://www.youtube.com/watch?v=1Vs4pLwYo54

The ABCs of board game design (G-L): quick explanations for common terms used by board game designers (video):

https://www.youtube.com/watch?v=83KNC-qq394

Tips for board game designers entering their games into BoardGameGeek contests (video):

https://www.youtube.com/watch?v=kLF9RZNqx5c

Playtesting conventions: what new board game designers need to know about attending (video):

https://www.youtube.com/watch?v=vdojDP4Ywpg

Area control: what the mechanism is, games that have used it, and the experience it offers for players (video):

https://www.youtube.com/watch?v=Bp-WWRF8Y7I

The ABCs of board game design (A-F): quick explanations for common terms used by board game designers (video):

https://www.youtube.com/watch?v=YV1JffFIaO0