This is a very simple guide on how to get started and purchase your first cryptocurrency.
There are numerous other ways but this is probably the most simplistic for the newcomer until you get to learn the ropes and fly for yourself

1
.) sign up to Coinbase.com
2.) get verified (can take a couple of days)
3.) Once verified send €uros to you Euro wallet on Coinbase via credit card (instant) or SEPA Bank transfer (up to 5 working days)
4.) When €uros arrive in your Coinbase account/wallet then buy some ETH on Coinbase.
Whilst you are waiting on your Coinbase account to be verified sign up for an exchange account.
sign up to:[URL="https://www.binance.com]Binance.com[/URL] its a very good exchange for starters with a very good selection of cryptocurrencies.
You can still trade on Binance (albeit limited) whilst waiting to be verified ..no more new registrations available 5.)Send the ETH you bought on Coinbase to your Binance/exchange account and buy XRP (Ripple)
6.) Congratulations you've made your first purchase 
7.)*N.B* move your cryptocurrency off the exchange into a crypto wallet as its recommended to take your purchase off the exchange(s) due to risk of hacking.
again; this is just a rough quick guide to get you going, but the same process can be used to purchase many other cryptocurrencies.
Hope This Helps