1. always try to keep all of your hearts up on your tamagotchi's stats
2. don't feed your tamagotchi too many snacks, though, because it will get a toothache. (but it will make your tamagotchi want to play games more!)
3. love your tamagotchi but not too much, or it might get spoiled.
4. codes are your friend.
5. as tama_life said, clean up your tamagotchi's poop ALWAYS. sometimes it will beep when it pooped but most times it won't, so you have to constantly check your tamagotchi for poop.
6. don't take tamagotchi's too seriously.
7. tamatalk is an excellent place for you to learn new things about tamagotchi's so welcome!
(p.s. it's always good to keep a tamagotchi log so why don't you start one? other people like to read them, too. ( <_<