Yes it's a wast subject but on the surface it's actually quite simple,if you can set up and run a PayPal
account then you sure can use crypto as well.i have some how to buy Bitcoin the easy way guides on my channel,and on steemit there is a countless amount of tutorials on crypto for beginners.i recommend you start with $5 dollars of BTC and make 2 Paper wallet's and practice sending it to your self