Recently got involved in Crypto so here's some info which should get you started:
Get an account set up on https://www.coinbase.com. They have an app also. Verify it and you can buy some bitcoin using your card or you can also pay using bank transfer.
If you want to trade in other cryptos then you should set up an account on an exchange such as https://bittrex.com. This is the one I'm using at the moment. What you do is send you bitcoin from Coinbase to Bittrex and then you can use the Bitcoin to trade.
I'm currently invested in Ethereum and FunFair.
Blockfolio is an app I use to keep track of my portfolio. I input the info about by market positions and it monitors if I investment is currently down or up. The markets are extremely volatile!
I recommend https://coinmarketcap.com/ for monitoring prices.
Id advise you to bookmark them links as there are some bogus links appearing which may lead to your various accounts being compromised.