Are you new in Bitcoin in general or just trading Bitcoin? Because if you're new to Bitcoin as a whole then I would say that you must not learn Bitcoin trading immediately.

Now let's assume that you have knowledge about Bitcoin already and you want to try something different like trading, I would suggest that you just watch videos online because you need to learn the basics first before entering. As for your brother who said that he will "assure" you that you will gain in Bitcoin trading, stay away from that person because in Bitcoin trading, there's no such thing as assurance. Even a pro trader that's been trading for a long time doesn't have any assurance on whether he will end the day in profit or not.

Now if you want to gain more experience in trading, the only thing that I can recommend is through a demo account, but I personally don't do it because trading using real life money will be better in terms of learning because you will also make real time decisions that will shape you to become a better trader.