Their is no best business for young men, all businesses are good to go with. It depends on your motive to drive forward with any business of your choice. You can try grocery business, or agro farming, livestock rearing, crypto savings, crypto mining. Too many of them, it depends on the one you have good idea for.
The motive of entering into any business is the most important thing to be considered, if you ask me. I have looked at how people start businesses without any motive and fail at the end of the day. This is something that you should really worry about when it comes to doing business.