Sometimes colleges or business give students or employees a benefit of providing education for them. If you don’t work or go to school where they have that, then you will probably have to pay for it yourself.
Also on fetch - it doesn’t work everywhere, but there are polyfills. Also there are fetch api’s on npm that allow you to do even more with it.
As IsaacAbrahamson mentioned, some businesses do offer a free organizational login on Lynda, you just need to check. Assuming you’re in the US, some public library systems also have a free organizational login (you just need to sign up to get a library card)—that’s actually how I’m using Lynda right now. (If you’re outside the US though, I’d guess there’s probably much less opportunity to get free access.)