I know very little about BTC. I have a few grand and would like to but some at around 100.00 each in hopes of doubling and cashing out. Is there a good step by

I know very little about BTC. I have a few grand and would like to but some at around 100.00 each in hopes of doubling and cashing out. Is there a good step by step for beginners? I'm not worried about secrecy and track ability, more ease of use, being able to do this all from the comfort if my computer without trips to Walgreens or doing wire transfers. J have no intention of buying anything other than perhaps donations to reddit and Wordpress.