"I'd like" is short for "I would like". You can use this when you can add (if...) to the sentence, although the (if...) part is often not added. Examples: I like you. I'd like you if you were nicer to me. I like tea. I'd like tea (if you don't mind making me one). I like to learn languages. I'd like to learn languages (if I had the time). I like to help you. I'd like to help you (if that's OK with you).