Don't be too gullible when you receive information that just buying Bitcoin can make you very rich. I assume you heard stories from people who may not be very familiar with how Bitcoin works because they only mention that you can become very rich after spending.
It's not easy to get rich, what they say is absolutely not true that once you buy then you will be very rich. The way Bitcoin works doesn't undermine what they say. There is a process, there is a way and it takes time if you want to invest in Bitcoin.

Your classmate is right, you should multiply and add to your knowledge and reading references first to learn basic knowledge about crypto and Bitcoin then after that learn about investing in Bitcoin and the risks involved.
There have been many reading references in online and offline media about Bitcoin, you can also actively read in this forum and you can use the search button on the forum to find what you want to know.
Don't be careless to use your money to buy something you don't know what it is and how it works. Once you understand how Bitcoin works maybe you can decide whether using your money to buy Bitcoin is a good idea or not.