First of all, avoid losing it. From what I've read, bad business deals and shady investment managers are the easiest way to lose money. It will be easy to think

First of all, avoid losing it. From what I've read, bad business deals and shady investment managers are the easiest way to lose money. It will be easy to think, at some point "I'm an engineer, I'm smart, I can do this investing thing" Nope. Index funds are your friend, with reputable institutions, covered by some kind of fraud insurance or regulation. (I don't know how the latter works in your area, but see how your money is protected) Let's say there is a market crash and you lose 30%. You're still set for life, and it will come back as the market grows. But bad deals, fradulent advisors: they can take 100%. Do nothing fast, and avoid telling people you have money. Your life sounds nice, this will help you avoid changing that. You have plenty of time, and a wonderful gift that will make the rest of your and your family's life more comfortable :)