How to integrate Steem in my own project?

Hello all,

This is my first post here, I came to know Steem in a Blockchain Talk at Pixels Camp in Lisbon and the speaker told us we could make our own project on it. Could anyone tell me please, how do I implement this in my own project?

This can be such a general question, but try to give the best and most complete answer you can, specially if it's a link to some good documentation. I don't find Steem docs useful to produce my own project out of their blockchain.