Call it thematic integration or resonance or ludonarrative assonance: here’s a deep discussion about making your game's mechanics match the theme, and vice-versa (video):

https://www.youtube.com/watch?v=urOxG_nZ2F0

Two publishers discuss the pros and cons of publishing board games through crowdfunding versus going straight to retail (video):

https://www.youtube.com/watch?v=mhfLOHq9XNs&t=1373s

David Turczi talks about his approach to game design, working with other designers, and what goes into making amazing games (video):

https://www.youtube.com/watch?v=paxJFQ90qAY

A graphic designer working in board games discusses how good graphic design helps bring games to life (video):

https://www.youtube.com/watch?v=piFT5NhhGjA

Walking through the submission process for 10 different publishers—and general tips for submitting your game for consideration (video):

https://www.youtube.com/watch?v=lgdxymyZC3s

What makes a good board game for children? (video)

https://www.youtube.com/watch?v=9m-d7U-i8g8

A wide-ranging discussion about various board game design topics, including development and how to make your game less fragile (video):

https://www.youtube.com/watch?v=RnAC-92uzWI

Soft skills that board game designers need: giving and receiving feedback, correcting a playtest experience that has gone off the rails, dealing with publishers, and more (video):

https://www.youtube.com/watch?v=0bGs8WSxZE0

How can you reliably come up with good game ideas? Here are 5 different techniques to come up with new ideas that can grow into great games (video):

https://www.youtube.com/watch?v=uo-MAq_7YxI