"He does not like cats."
Translation:A lui non piacciono i gatti.
Piaccere is easy once you learn that "io ti piaccio" does NOT mean "I like you," It means "I please you," which is good english for "You like me."
A second thing to learn is that if I call you "Donna" instead of "ti", the subject "io" usually goes after the verb:
A Donna piaccio io = According to Donna, I am a pleaser.
Same meaning, unusual word order to an english speaker, who would say I please Donna, (so she likes me.) Since "io" means "I" and not "me", Italians don't get confused.