Building a brand in board games: setting expectations with the promise of your game and delivering on them, pitching it to publishers, connecting with players, creating a company, and more (video):

https://www.youtube.com/watch?v=nVzlLIdHe20

Four interesting examples of game design theory and how designers can use them in their games (video):

https://www.youtube.com/watch?v=Jn38jGiEdKc

“Do as much as you can with a project BEFORE you start investing a lot of money into it. Test your prototype, polish it, get it to as perfect as possible before spending. From there you can start investing in the art, editing, etc., but get it as close to final as you can first – it can save you a lot of future headaches.”
— Isaac Vega

Designing board games with manufacturing in mind—tips for cutting costs without sacrificing gameplay (video):

https://www.youtube.com/watch?v=jF8Pvz_18Rg

Recommendations for board games that game designers should play to learn about mechanics and industry trends (video):

https://www.youtube.com/watch?v=MvUAri5EAbw

How to go from crowdfunding a project to selling it through e-commerce (video):

https://www.youtube.com/watch?v=k6CZw8snoro

Rob Daviau on how to playtest like a pro, receive feedback, iterate, and playtest a whole lot more (video):

https://www.youtube.com/watch?v=Wt5_jrytBTs

The board game designer’s oath: some best practices for doing right by your playtesters and fellow designers (video):

https://www.youtube.com/watch?v=7ekw8FYQUG4