Scores of game design tips on numerous topics:

https://twitter.com/Talen_Lee/status/814224683398631424

“There’s an instinct to want to satisfy everyone, but you can’t. In a playtest, your job isn’t to market, it’s to collect useful feedback.”

— Brian Engard

5 steps to getting honest playtest feedback (video)

“Wherever one can, it is a good idea to make correct and fun play line up.”

— Richard Garfield

Ways of reducing downtime at higher player counts:

https://www.reddit.com/r/tabletopgamedesign/comments/5jw7bu/how_do_you_avoid_downtime_in_a_5_or_6_player_game/

Advice for aspiring board game designers with limited mobility:

https://www.reddit.com/r/tabletopgamedesign/comments/5jgctx/board_game_design_as_someone_that_isless_than/

Advice for managing projects of different scopes (audio):

http://cardboardarchitects.libsyn.com/episode-66-design-scope

“Most designer / publisher interactions do not result in a signed game. So concentrate on professional, positive experiences.”

— Ben Pinchback

Making money in the board game industry (video)

Tips for creating a more usable print-and-play file:

https://boardgamegeek.com/thread/1689874/pnp-file-design-guide-or-suggestions

Advice for getting through designer's block (video)

The difference between a "scientific method" approach to playtesting versus guessing and checking:

http://pulsiphergamedesign.blogspot.com/2016/12/are-you-designing-game-or-throwing-one.html

Advice for designing scoring tracks (video)

71 ways to become a better game designer:

http://www.boardgamedesignlab.com/71-ways-to-become-a-better-game-designer

Advice for branding yourself in the board game industry (video)

How to turn an idea for a mechanism into a game (audio):

https://www.buzzsprout.com/48513/451085-episode-25-turning-a-mechanism-into-a-game

T.C. Petty III on getting started in design, researching design theory, joining the community and more (audio):

http://boardgameuniversity.libsyn.com/board-game-university-episode-47-tc-petty-iii

What makes a game replayable? (audio)

http://thedieispodcast.libsyn.com/episode-99b-replayability

Advice for avoiding publishing failures (audio):

http://nerdfountain.libsyn.com/nerd-fountain-85-power-to-the-meeple-54-metatopia-2016-learning-from-and-preparing-for-failures-with-jeffrey-norman-bourbeau-mark-sierens-and-matt-fantastic

What makes a good social deduction game? Two podcasts discuss:

http://thegamecrafter.libsyn.com/social-deduction-games-with-the-game-crafter-episode-101

http://www.buildingthegamepodcast.com/2016/12/04/episode-236-play-the-player-and-solo-spying/