Problem with Hammer

Ok i’m going to say this once. I am a n00b to using hammer but am a quick learner, my problem is i have no idea where to get hammer. I would really like to start mapping but i’m totally friggin lost the one copy i found on the internet didn’t exactly work, when i opened it it said that there were no game configurations available… is this common, and when i said yes to open the new user guide it said it couldn’t find the file. Please if someone could help me it would be much appreciated and i would credit them on my first upload able map!

Hammer is packaged in the source SDK, which is in the “tools” section of steam.
Additionally, read:
http://optimization.interlopers.net/

Before mapping

oh wow, that was almost too easy to find, thank you very much!