Most versatile coin to LEARN would be Ethereum IMHO. Browse for a recommended wallet on your phone (like imToken or Trust) and get some Ethereum on it. Coinbase or Bitpanda is a place to buy ethereum for normal currency. From there just get to know all about crypto, wallets, transfers, signing, smart contracts, coins vs. tokens, keys, collectibles...
For me that would be the better INVESTMENT. Especially if your budget is low.
And one more thing. Be prepared that you will loose it all. Either because you gave away your secret key or you transferred all your ethereum to a shitty ICO or...
Good luck!