Where should I invest small amount of money/month

I'm kinda new to this and I want to invest 20/50€ a month on something to make some long term revenue. How should I do it, I'm using trade republic. If some1 can explain me how this works, should I use only 1 company? Or invest in 2/3/4/5 different amount of money Thanks. submitted by /u/IndependentStore9566 [link] [comments]