How do i invest in

Well with bitcoin, the value of it fluctuates by the hour. Honestly, if I were in your position (wanting to invest in bitcoin) I would buy one bitcoin, wait until the value goes up about $10 then sell. Now that's with just one bitcoin.
Fun Fact: The founder of bitcoin is rumored to have 1,000,000 BTC, which is worth 2,643,330,000 (June 21, 2017 5:13 PM PST)