I can tell you how I do it, but I am not certain if it is the best way, but so far it works.
I use coinbase app on my phone to convert dollars into either BTC/LTC/ETH, then I either send it to my Exodus app on my computer, or to bittrex depending on what I am planning to do with it. My first transactions were simply about acquiring BTC but soon I learned how to make money with it. I put in a few hundred dollars and it has since more than doubled, and I am getting more comfortable about my trades and how I plan them. It is different for everyone but this is how I did it. I probably don't need to add money anymore, I can pretty much move it around and grow it. Of course, adding is always helpful. I don't put all my eggs in one basket either. In fact I have used 20+ baskets so far. (different alt coins). Hope that helps.
Yes, it helps. Can I ask you when I have question about it? Are you on steemit.chat?
Please feel free to ask anything, I won't give you nonsense if I don't know something, but I will do my best to find the answer or point you to those that I have trusted through this. I will create a new temp email to get contact with you and rerouted that to my main email simply to avoid being spammed if it is picked up here.
No need for new email, just join steemit.chat
Done ;)