I brought the game today, but I could not find any manual in the game or the documents folder.
Where can I find the manual? I have no idea how to play the game.
Thank you.

Thank you for the reply, That's a bit shame.
Anyways, I will look into it in the game.
Thanks again.

There was no tutorial when I first started the game. :/

So I don't know how to craft items.

Talk to the Guide. Crafting is done from your inventory screen.

Ah ok thanks. ;)

No problem ;) It can be a bit confusing when you start and there's no "normal" tutorial, but you'll learn it all eventually :)

I remember when the game came out (version 1.0) and there was no tutorial at all, you had to guess what were the requirements for a house, etc. :o)

This game could really use a manual. At least there is a wiki. Here is a very thorough beginner's guide:
[url=http://terraria.gamepedia.com/Guide:Getting_started]http://terraria.gamepedia.com/Guide:Getting_started[/url]