Unfortunately all the books I could recommend are canadian focused, but the gist is investing in etfs with low mer and high diversification. I use asset alloca

Unfortunately all the books I could recommend are canadian focused, but the gist is investing in etfs with low mer and high diversification. I use asset allocation etfs, little bit higher mer but extremely straightforward. Don't try to beat the market, follow the market. Over 20 years this seems to be a decent strategy, granted that nobody can predict anything, so "safe" doesn't really exist with "investment"