Here, you can build whatever you want, and let your imagination loose! Simply press "e," select your block, and start building! Note: You can't be hurt in creative. Mobs will simply pay no attention to you. Go forth, young builder!
Well, those days of staring longingly out the window, wishing you had friends, are a thing of the past! With Multiplayer, you can play with friends! It's actually very easy. Simply: click the "multiplayer" icon, click "add server," and go to the second slot. Now, comes the hard part... choosing your server! There are tens upon thousands of servers for you to choose. Note: some are not friendly/kid appropriate. So be careful! After choosing it, click save. Ta-da! Now you can meet up with your MC buddies and chat about the latest things... did Notch really add iPhones, or was it just a prank?
Are you tired of having to meet your sibling on a server with tons of people you don't know? LAN solves that problem! Simply open a new world, press Esc, and click "open to LAN!" Your sibling should see it on their multiplayer section. Have fun playing! Note: you can use cheats in these worlds, so don't get too crazy adding huge slimes or op enchants!