@sherwood Do you due diligence okay, I just give info on what I know.
I don't know what are your position and what you do, so take my opinion as some random guy on the internet.
If you just planning on holding the crypto, I think Bitcoin, Ethereum and XRP are good for new comers. Just buy and put it on luno.
I recommend watching Blockchain Backer videos on youtube, that dude have good info on cryptocurrency. Some of the topic are about crypto 4 year cycles, taking profits etc.
But, if you want to go further, there are more cryptocurrency other than above 3 type (Bitcoin, Ethereum and XRP). For that, you could buy it at different exchanges. Some of the exchanges that I currently used are Binance and Kucoin. Both are good in my opinion.
About the leverage, it's a type of trading. But if you got a wrong move, your crypto would be liquidated. That's mean your crypto would vanish. Better stay away unless you know what you're doing.
But as always, invest in what you can lose. And DYOR(do your own research). Maybe you could read more at /r/cryptocurrency, there are more discussions there if you want to know more. I'm open if there anything you want to chat.
Remember, don't give your coins or private keys etc, if you lost your coin, there are nothing to be done. Exercise caution.
Use coingecko, coinmarketcap, twitter, reddit, youtube at your disposal. There are lot of info to be found there.