"It's good to me" is used when you are expressing your opinion or saying something treats you well. (For example) A asks: Do you like the cookie? B answers: It's good to me. or A says: The game eats my phone battery! Does it eats yours? B says: Nope, it's good to me :) "It's good for me" can be used to say something suits you. (For example) A asks: why do you bake cookies all the time? B says: Bec