What should I be aware of as a young investor?
If you are going to the frenzy of individual stock picking, like almost everyone initially, I suggest you to write your plan to paper. Like, I want an orthogonal set of assets and limit single investments to 10%. If with such limitations the percentage of brokerage fees rise to unbearable large, you should not invest that way in the first hand.  You may find better to invest in already diversified fund, to skip stupid fees. There are screeners like in morningstar that allow you to see overlapping items in funds but in stocks it becomes trickier and much errorsome. I know you are going to the stock market frenzy, even if you are saying to want to be long-term or contrarian investor, most investors are convex, i.e. they follow their peers, despite it would better to be a concave investor (but as we know it can be hard).  If the last part confused you, fire up a spreadsheet and do a balance. It is a very motivating activity, really. You will immediately notice things important to you, not just to providers such as morningstar, but alert it may take some time. And Bogleheads become to your rescue, ready spreadsheets here.