@igortachkent do you own your house? If not, buy a house, or as much of a house as possible.
100k is a tricky number. It's more than enough money to bootstrap a fairly humble trade business, but it's not quite enough to jumpstart something massive and start paying other people's salaries.
I'd strongly suggest, if that 100k is all the money you have, that you put
maxiumum 20k of it into starting a business. At your age, you could go to uni
for free with that money, which will give you a huge leg up for the rest of your life. You could also sink it all on the first bad idea you find and lose it all in weeks.
Honestly, 100k is worthy of a couple of hours with a financial planner. I appreciate the want to start earning capital, but at 19, there are many, much smarter moves you can make with 100k than buying some unsellable waste from china.