hundred bucks won't get you far, for example, just depositing or withdrawing that money from an exchange, you'll have to pay 2-3 dollars, which means you already made a loss of 3%. From the other side that means that you'll potentially make much more. But the first thing you have to make clear to yourself is whether you want to trade or invest, these are two different things. If you're inexperienced in trading I would suggest to not go into it. There are many examples from traders who have been rekt within a couple of weeks and never saw the light again, trading involves as well a lot of stress and psychological toll.. while if you choose the second option, investing, you'll be better off just investing in something that you believe in and sitting on it. In other words, you won't have to worry about selling or buying, you'll buy a couple of things with the hundred bucks and eventually sell in 3-4 years (depends on your span) which is much more easier and relaxed.