Young hackers who have a surplus of income and have funds to spare that aren't being channeled toward debt / family / donations, heed me: save as much of your salary as you can, and put it in boring investments (index funds / etc), probably through vanguard.com (no affiliation, I just use them and have heard nothing but good things from people I trust). You can pretty easily set up your job's direct-deposit system so…
This book taught me the fundamentals of passive investing ( https://www.amazon.com/Random-Walk-Down-Wall-Street/dp/03933... ) and this website is THE online community for Bogle-style, passive investors ( https://www.bogleheads.org/ ), once you understand the basics.
Dead practical advice despite the somewhat sleazy writing style (see title of book).