Mining Bitcoin generally means using device specific machines, but if you want to get started at the basement level on your PC you can start mining with CPU only, but is it worth the effort?
A few weekends ago I decided to do a test on the cheapest way of earning Bitcoin by using some of the more commonly known platforms and software for mining with your PC and CPU.
The three sites I tried were the Minergate, Nicehash and CryptoTab browser mining site.