Reddit mentions of Operating Systems (3rd Edition)

You're nearly 16; I'm assuming you're planning to go to university? My suggestions are based on that assumption ..

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My recommendation is this - forget specifics except as a tool to understand theory! You've got another 6yrs before you're going to start looking for jobs and in that time, the software landscape can change a lot, so it's not worth focusing on e.g. Docker & Kubernetes until a year or two before you finish your education.

Programming languages - pick one to focus on and get as in-depth as you can, but play around with and write a handful of scripts in as many different languages as you can. The focus should give you a good understanding of how and why languages work, how you can be caught out without that understanding, etc (I recommend Fred Baptiste's 'Deep-dive' courses on Udemy, if you stick with Python). On the other hand, the more languages you learn, the easier it becomes to learn a new one - so if e.g. Python dies out while you're still at uni, you can easily switch to the next big thing.

That scattershot approach should be applied to applications as well - focus on what they do and why without getting bogged down in how.

When it comes to specifics, definitely learn networking, databases (both relational and nosql), operating systems (I recommend https://www.amazon.com/Operating-Systems-3rd-Harvey-Deitel/dp/0131828274 - still got 1st Ed around somewhere), security ... you're working on getting a good understanding without worrying about specifics.

Then a year or two before you graduate, come back and ask for advice on specifics.

In the edition of this operating systems textbook that I have, one chapter begins with: "And then in the '90s, when the internet literally exploded...".

For some reason no one else in my OS class was quite as amused as I was by this.