How to teach puppy proper socialization

For context, she's a 7 month old lab and she doesn't seem reactive on walks. Trouble is, someone gives her attention, and she jumps all over them and ignores my cues. Second, when we crate her at home and someone comes over or even knocks on the door and we talk with them, she won't stop barking. I don't know how to teach her to ignore people. She could care less about other dogs, but she still hates our cat lol.