im getting a onyx lite for my b-day soon and i was woundering what is the diffrince in a lite and a regular one

and should i use screen protecters

last question what should i buy for my first game

1. Can you get wi-fi and is it free
2. can you play against other people on wi-fi
3. what are some of the best games to play on wi-fi

please no scarcastic remarks