The best investment is the doing of the things you do and know better. If you are expert in any or more fields as above you write that field (or fields) is (are) the best investment for you. If you are not an expert in any of those then there are to many the other possibilities but no one can tell you for sure who is the best. No one can predict this. Every kind of investment has its risks and everyone judge about those according to him's mind, him's ability to analyses those and to lay out conclusions. So you ma have several judgments for the same thing. To not forget that everything need even a little luck.

Me have two kind investments in my today's plans. An online site which have 5 years of life in market and 9 years of development. Which give about 0.5% profit every day and declare the source of its profits (if you want I can give my reflink with pm). Then *the second investment) is investing in the Horizon project. For the moment and mainly buying their cryptocurrency named Horizon (HZ) with the hope that it will be increase of the price of it in the future. Both are risky and I know that. But the amount involved until today are few. Then is another third but is very long term. Like bitcoin. Which I buy because I hope in its increase of price after to many years. This third is not counted because seems without end; has began three years ago and no one know where will be seen some profit from it. Then to see and to do.