Are there any resources on 9x9 strategy? For example I think a good strategy is to try to split up your opponents groups, for which you can then use tactics like moves 7-10 of this game https://online-go.com/game/22083323
Resources like this https://senseis.xmp.net/?9x9Strategy seem more focused on openings (but with little explanation for the underlying idea) and techniques instead of overarching goals.
I havent seen much strategy recourses on 9x9, but basically what you want to do is:
as white (playing with 5.5 komi) to make 2 independently living groups, OR split the board into 2 ~equally sized halves / territories.
as black, to stop white living with 2 separate groups or make sure that your half of the board is significally larger than whites part of the board.
White will usually win by making 2 living groups, cause those with komi is usually enough to make sure that black cant find enough points to win.
Note that on 9x9 the direction of game will be decided really early, so thats why most 9x9 resourses are about opening, because after 8-12 moves the game is mostly just about middle game fighting and outcomes rely on players reading skills.