OK the first thing to do to purchase bitcoin is to use my coinbase affiliate link here https://www.coinbase.com/join/56ce179bcca2f163a90001a1
by using this link to COINBASE you and I will both receive $10 worth of free bitcoin when you purchase $100 of bitcoin. and you can invite folks with your own affiliate link(by clicking on your icon)You will of course have to follow the directions on installing your new coinbase account. I feel coinbase is the most secure exchange to buy bitcoin. If you link it to your bank it will take a week to process however linking it to a credit card will allow you to purchase immediately. For me I also have my own crypto wallet that I transfer from coinbase to so I am the only one the the private keys.
It is call exodus find it here https://www.exodus.io/
ps here is a VIDEO on how to do it