What solo gamers do and don’t want from a solo gaming experience:
https://boardgamedesigncourse.com/game-mechanics-creating-a-great-solo-gaming-experience/
What is a network-building game?
https://www.thedarkimp.com/blog/2021/02/10/what-is-a-network-building-game/
Various ways of sparking inspiration for a board game design:
http://www.weirdgiraffegames.com/carla/wordpress/2021/02/08/ways-to-spark-inspiration/