I beleive that what he meant was to buy as much as he can BTC for 50 euros...

My advice for you is to buy 40 Euro Bitcoin, 7 Euro Litecoin and 3 Euro Dogecoin. Bitcoin is very old and the best you can get from a new price growth is 10x (maybe in 3-5 years), but litecoin and dogecoin are at the beginning. A 100x price growth of either Litecoin or Dogecoin in 1-3 years will be better, isn't it?
So go also into some alt-coins with 10-20% of what you have for bitcoin buying.  

Bitcoin price is really dynamic. So if you buy today at some price, that may fall tomorrow, but it can also increase day after tomorrow. You are young at age so you can actually think of long term. I am sure, bitcoin will not disappoint you in longer term. But if you are trying to make quick profit, then it is up to your fate. But if you are thinking long term, go ahead and buy bitcoin.

I don't like giving out advice because I don't want to be responsible for people losing their money on my bet, which could always happen.
The only advice I ever give:

Don't invest more than you are willing to lose!

I understand as a student, you don't want to lose anything, but you have to understand that investing comes with a risk. Especially cryptos are very volatile. If you're not comfortable with that, you should put your money in a savings account.

If you do jump into this, regard your €50 as lost and you will not be disappointed, ever!
It's too bad you just missed the dip to €2600 yesterday, which to me was a good deal. It's up to you now to figure out when you wish to jump in.

In short: yes, it can be worth it in the long term. €50 is actually a perfectly fine amount to get your feet wet and test your nerves  

Hope this helps a bit. Good luck!

I started with $30 every week and been buying ever since. Recently just stopped because of the high price and my funds are focused into other ventures. The thing is it's never too late to get into something even if it's crowded. There's still a chance to get some profits in the long run if you're a patient person. I myself believed that it was a waste buying into $200 thinking that it's a dead coin anyway, but apparently the smarter side of me just bought while I can and I have the best decision of my life.

The biggest problem with Bitcoin is that people don't understand that it can be divided by 100 million. Many think that if you want to purchase BTC, you have to go for one full coin (which is trading at $3,650 right now). That is not true. You can even purchase BTC0.100 or even BTC0.001.

just start buying and keep buying whenever you can

Your friend's probably right in the sense that the trouble needed to get verified on an exchange could be bothersome, depending on where you come from. Also, to scout for a good price for 50 EUR might be tough. Why? Because most types of exchanges take a flat fee plus percentage. It doesn't seem like a lot when buying hundreds or thousands of dollars worth, but if you have to pay a $5 fee to deposit your cash for the trade, you lose 10% immediately.

My suggestion: localbitcoins. Most sellers allow online payments, go for an escrow. You'll get your full 50 euros worth (at the trading price) and it costs very little to withdraw coins out of LBC to your own wallet.

BTW, I complete my first year of being in Bitcoin today. Exactly one year ago, it was around $600. Had I had bought $50 worth then, I'd have about $300 now.

You are right, We can go to purchased a part of 1 bitcoin, because not all peoples are rich to buy one or more bitcoins. For exemple, in my case i bought in these days 0.1 bitcoin, and i am happy with this purshased because i believe to much in bitcoin and I know that bitcoin price will increase too soon.