In fact, Bitcoin is not much more about how mining is done; why he deserves a long essay on his own which is so important.
Getting bitcoin is not the only goal of mining. The Bitcoin miners are also trying to keep a decentralized account book called Blockchain, one of the features that makes BTC BTC, and why it is so and what it does is another matter of writing. For now, let's just think of the mining concept as "finding / removing / printing bitcoin" ...
@bwar