None. Buy Bitcoin. Be smart.
You are either brainwashed or joking right now. Basics of investments is - do not put all eggs in one place if you dont want to lose most of it.
At least invest in Btc and some other cryptocurrency
So I think buying Bitcoin just can't be smart Because before investing you must have sufficient knowledge of the place to invest And without investing in monopolies you can earn a lot of profit by buying bitcoin in different places and keeping it in stock.