Welcome to cryptoworld,
so far,the best wallets are Trezor and Electrum because it's very easy to use.
To be honest i am not really familiar with that recommended thing(to be exact i really don't know about it at all),
if you're in europe it'll be better if you're using a well known company such as Coinbase and Kraken after that transfer it into your offline wallet.
I recommend it because it's a reputable international exchanger and many people used it as a place to buy Bitcoin,
but,if it would be better if you know about your local exchanger,because if something goes wrong you know where shold you do.
how it works :
Download the Wallet(Trezor,Electurm and others) wait for synch[Your PC] >>Send your money to your account & Buy Bitcoin in an exchanger >> Send it to your wallet.
Your procedures would be: deposit eur in an exchange, buy Bitcoin/ other coins with the desposit eur, then transfer the coins you bought to a wallet.
For exchanges: Coinbase, Kraken, and Bitstamp are fine for EUR
For wallets: hardware wallets (e.g. Trezor, Ledger) are offline, desktop wallets (e.g. Electrum, Armory) are installed on your machine. That means, if your computer is infected, that could be a risk by using desktop wallets. They are generally safe, though.
For your case, I would recommend using Bitstamp (as Kraken's engine is slow, and coinbase is losing reputation these days), and just store them in a desktop wallet (Electrum is by far the best in my opinion), because hardware wallet like Trezor costs 90EUR which doesn't make sense for your 500 EUR, and ledger is always out of stock and would take a very long time to ship.