no, it is a steam game
No. If you buy it on steam, then you will be able to download it to your steam games library and install it. After you do that, you'll be able to play it on steam. However, if you're on a mac, you can't play terraria. By the way, you have to buy the collector's edition to get a physical copy of the game.
No
It was created in C# in the XNA Game Studio. (Terraria website's FAQ)
If you don't mind a little bit of gore terraria is a safe and fun game.
There aren't really Terraria "accounts". You just play the game without logging in.
Minecraft or terraria
A person named Blue.
someone said that terraria is not a kids game im 8 years old and i play terraria i manage be at post pillars im stuck at moon lord tho
It's usually in the bottom right or left corner of the title screen when you start the game. Don't know if right or left, haven't played terraria in a while.
terraria (computer/consle/phone game)
Left click.
I do not know the exact version but i do know it is quite old. This doesn't matter however as steam automatically updates it.