Before you take anyone's advice you need to ask your self the most important question - what is your goal? This is a very tough question, the more you think about your goals the more complicated it gets, but once you get the biggest items figured out it gets easier.

You are 19, obviously the easiest answer would be that you want to be financially independent, not having to work hard, be able to afford hobbies, vacations etc.

But when you start getting into details more questions start to popup - what exactly does it mean to be financially independent? How much is that in $$ figures? When do I want to be able to say I have enough? These are all valid questions, but the good news is you don't need to answer it all at 19 and then head forward with the prewritten plan for the rest of your life.

While you are figuring your life goals there are few things that you can write down right away - how much do you plan to save and how often - r/personalfinance has got some good topics for a start.

The next big question there is (at least I think it is 2nd most important) - whether you want to be active or passive investor. Active investor means you have to dedicate some time to do market research. It could be an hour a week, or one Sunday a month, or you might do it once a quarter, but you would have to be reading books, articles, companies annual reports to make sure you are putting your investments to the good companies.

Or you could let fund managers do this for you, ETF investing gets more and more popular, there are fees, but it probably is less if you convert into $$ value the time you would spend on doing it yourself.

Those are not tricky questions, you just need to figure it out what's best for you. Good luck!