Adam Porter shares an epic list of 100 lessons about board game design and finding commercial success as a designer, learned over a decade in the industry (video):

Lessons 100-91: https://www.youtube.com/watch?v=3D8omU-Ejj4

Lessons 90-81: https://www.youtube.com/watch?v=uEbA8BYJ2Xs

Lessons 80-71: https://www.youtube.com/watch?v=UYs3wApBYVE

Lessons 70-61: https://www.youtube.com/watch?v=INsfDpTQzlg

Lessons 60-51: https://www.youtube.com/watch?v=Ozai-xir6G0

Lessons 50-41: https://www.youtube.com/watch?v=Z0EvkRnjzZI

Lessons 40-31: https://www.youtube.com/watch?v=3LYVscmpj-A

Lessons 30-21: https://www.youtube.com/watch?v=JITsKXWf7pI

Lessons 20-11: https://www.youtube.com/watch?v=pvol9tXnyFk

Lessons 10-1: https://www.youtube.com/watch?v=cIGP-CE0Dow