Then the best way to invest is to invest in yourself to have money in the future. Personally, I wouldn't even bother with stocks with less than 10k unless you're doing it purely for educational purposes.
I'd probably suggest etfs or index funds for you but at less than 1k is it even worth it? I don't know what kind of employer retirement plans you have, but in the US companies will sometimes match your 401k contributions up to a certain percentage. Obviously hungary will have some different system if they offer anything, but If your job does anything like that, I'd at least hit the max amount cause it's just free money at the expense of you missing out on available cash at the end of your paycheck. Just do a lot of research. Investing is pretty interesting and it's good that you're interested now.