Investing in a low-cost and well diversified index fund used to be the way to go and is probably still your best option (at least for the majority of your savings).
I’d read the little books by John Bogle (Vanguard founder), the Simple Path To Wealth (book or blog) and maybe I Will Teach You To Be Rich by Ramith Sethi (book).
That said, the future isn’t as certain as it was in the last 200 years. I doubt we will see the same levels of economic growth with the various crisises intensifying over the next few decades.
A house to live in in an area that is relatively safe from natural disasters would be high on my list as well.