My favourite chess tactic is one I learned early on when learning the game. I didn't see book opening as fun as might as well just set the game up that way and play from there. So I kinda did my own thing and if I played anybody who would template play book openings (many do) then going against that start and busting it would see them out of their comfort zone and me having a fun enjoyable game. I did win fair few and chess tournaments in my youth but been decades since played that it's almost a crime. Sadly finding people to play who don't get into a hissy fit if you don't do the book-opening they want to play was always an issue.