Do you have a sports that you keep betting on even though you don’t watch this sports live or you don’t know the full specifications of this game?
In my case, I keep betting on tennis whenever I have spare money on my casino balance from my VIP rewards(Rakeback) after my long game session on live games. I’m not really a fan of sports betting in general but I do place bet randomly on tennis especially the Asian Handicap on live match. I’m always betting on the underdog that already has 1 set advantage to the favorite players. I do this bet just for fun no string attached.
I believe this is the literal definition of “gamble what you can afford to lose”.

I have a sport that I would like to highlight. This is hockey. I never watch it, for me the game and everything that happens on the court is too fast, the puck moves at such a speed that it is impossible to see it. No matter how many times I try, I can't seem to get my interest in this game. But as for bets, that's a different story.
Regarding the fact that you said that you don’t use money that you can’t afford to lose, then I think this is one of the main or main principles in gambling, you’re right