OP, You own a lot of money so if you are interested in investing you must understand trading. so the first thing you need to do is take advice from a knowledgeable investor to know when you can invest in the market without losing money and making a profit. You analyze the market well and take the advice of the wise and then you join the trading. I want to tell you that you can invest in bitcoin if you want but do it for long term then you will get lot of money from bitcoin in future.
Investing is more on holding but there are a few instances where trading is involved, that is when we exchange our fiat with crypto of our choice.
We will do the opposite once we are now ready to sell our coins but it does not need any complications as what is present in pure trading. He can learn the basic principles of trading but the advanced methods are not necessary anymore unless if he also want to do trading in the background which was a good thing too so that he won't be bored, or waste time but money can always flow around him as long as he already mastered it of course. Investing is easy that it can be done on our own. It's risky to have a partner especially with the amount of money he have.