Resign Advice for Job switch

Hey, I need some advice. I might be resigning soon and I’m confused about what I should say to the team and managers. I really want to leave on good terms and not burn any bridges, especially in case I ever want to join back in the future. I also don’t want them to think later that, "she was lying" or not genuine at the time. What do you think is the best way to handle this? any easy escape like maybe future studies?