Basics of market research for board game makers:
https://brandonthegamedev.com/how-to-find-an-audience-for-your-board-game-make-them-happy/
Matthew Dunstan on co-designing, making story-driven games, creating expansions, and more:
https://www.diagonalmove.com/interview-matthew-dunstan-designer-of-monumental/
“Take ideas that you’ve developed over the years playing other games, and then put those ideas into a new way of playing something old, or a new way of playing a familiar concept. In doing so, you can develop a new game that hopefully many people around the world will enjoy.”
The basics of how to create a board game—clips from a panel discussion with industry figures:
https://blog.mindresearch.org/blog/how-to-create-a-board-game
Lots of great content for those in the publishing field (audio):
https://breakingintoboardgames.libsyn.com/breaking-into-board-games-episode-120-connor-alexander
Wargame designer Hermann Luttmann offers advice for new designers:
https://www.diagonalmove.com/so-you-want-to-design-a-board-game/
Hermann Luttmann, designer of Dawn of the Zeds and At Any Cost, on designing wargames and historical-simulation games, working on solo games, small-scale vs. large-scale games, and more:
https://www.diagonalmove.com/interview-hermann-luttmann-designer-of-dawn-of-the-zeds-at-any-cost/
“If it stops being fun and feels like a chore, take a break. Come back to it when you’re feeling it again. When you play a game, you can feel how much fun the designer had making it, so ensure that you maintain your own passion for what you love throughout the process, and most of all enjoy yourself, so you know that your players will, too.”
Daily exercises to get your next game design session off to a creative start:
https://docs.google.com/spreadsheets/d/1EL8_UgBh4VnNFJh6Fa8cnVVqxKtWEKbnTF7IAIN9cZI/edit#gid=0