I'll echo what this comment says from 2 years ago [0].
> 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 that a portion of your salary goes directly into your investments without you ever seeing it, it's a good set-it-and-forget-it system. It adds up over time!
I save into a pension fund every month. In the UK this is a good tactic because of the tax benefits. I hope it will provide me with a substantial passive income if I can keep the savings up for another 20 years.
Build up savings as a consultant, bootstrap a B2B SaaS for a handful of years (gradually transition out of consulting as the SaaS starts generating more income after some years). B2B is key since it's much easier to convince businesses to pay a subscription than consumers. Low burn rate during bootstrap phase is essential though.
https://hn.algolia.com/?query=passive%20income&sort=byDate&p...