I may sound like a shill but I think paying for O'Reilly is worth it. You get access to many books and videos outside the O'Reilly publisher. Definitely worth it, I tend to read a tech book a month (maybe 2 if it's "light.")
Many of the books being suggested in the other comments are available as well (will definitely start Hands-On Rust because it seems very cool, and Practical Common Lisp shortly afterwards).
Out of all the "tutorial" offerings I only pay for three services:
O'Reilly (four years so far)
Educative.io (two years)
Frontendmasters (eight years)
Every year I test out other services (pluralsight, lynda/linkedin learning, egghead, etc) but outside of one or three core offerings they don't seem to be a good value for what I want.
I find the quality for frontend masters to be extremely high, over the last 4 years they've gotten workshops from people working at Netflix, Google, Microsoft, LinkedIn, Amazon; while some of the courses have a short shelf life due to versioning issues of tech they are discussing/teaching, I tend to watch all of them when they get released.
Compare this to pluralsight, which I feel like 80% of the courses are just regurgitating the documentation back to the user very poorly, or udemy that whose courses are typically stretch to 20-40 hours when they topic barely warrants 4 hours (see any frontend course).
I like educative.io because they are the best interview prep site out there IMO, I also enjoy some of their specific topics outside of interview prep (devops, concurrency, threading, etc); what's nice about educative.io is that it's all text based, I read way faster than I can watch. Also helps that they had a really good discount a few years ago that I'm still using (something like 3 or 4 years for the price of a single year).
O'reilly is great because, as I stated elsewhere, they have an enormous collection of books not just from O'Reilly but Packt Publishing, Manning, Apress, No Starch Press; they also have decent video courses from the same publishers as well.
There are very few technical books I'm willing to buy a physical copy of, I don't live in a large space so I have limited area for the books I do have, I do however like reading technical books. I'm also grandfathered in at a previous price point, so I feel like I'm "forced" to get my moneys worth. So reading 12-15 books is the "worth it" spot for me.
I like having a physical book sitting on my desk practically screaming "Read me, why did you buy me if you're not gonna read me?" ... As opposed to all those ebooks not even downloaded, let alone seen.
Many of the books being suggested in the other comments are available as well (will definitely start Hands-On Rust because it seems very cool, and Practical Common Lisp shortly afterwards).
Out of all the "tutorial" offerings I only pay for three services:
O'Reilly (four years so far)
Educative.io (two years)
Frontendmasters (eight years)
Every year I test out other services (pluralsight, lynda/linkedin learning, egghead, etc) but outside of one or three core offerings they don't seem to be a good value for what I want.