I will be graduating soon from university with a masters degree in computer science. I will get a good salary when I start working and I will save about 1000 euros each month. However I'm looking for a way to invest my money, but in a halal way because I'm a Muslim. The halal way is simply that there shouldn't be a fixed interest rate for the investment. In the most simple form, a halal investment is like going to a merchant and giving him some money and tell him to use it to make business. If the business succeeds then I take profit relative to the investment I made. If the business loses, then I lose the money. So halal means i could lose or profit. Not in the banks where I'm always guaranteed to profit a fixed amount each month or year.
Can you please recommend halal ways to invest and grow my saved money?
Edit: I need to assert that my definition of halal investments here is very very basic. If you are a Muslim or have knowledge in Islamic finance, then I guess this question is targeted for you. Also if you know some Muslims who do halal investments, then probably you also are a target for this question :)