C Programming. Did it on the CLI while there were IDEs.

Will never work for companies like oracle / microsoft. Post matters for companies like Google.

OP asked "this level", by the way. It is hard to write macros for every such case.

However, OP may read about superoptimization, which is yet in research stage.

NativeScript I haven't used it btw.

Obviously. There was a moment an online application form was broken. myself being CS student, inspected the source code and typed `javascript:fnEditApplication` in chrome URL bar, which worked out.

For programming, "Data structures & programming techniques" -- pdf as lecture notes. But very comprehensive one.

For Linux / Unix things, APUE is standard one, and pretty nice.

Am not an expert though.

I use old HTML UI btw.

Companies like Red Hat are doing it in very good way... They leave lot for the community that develops these software.

But Microsoft is obviously a cancer (It did not give anything really to FOSS ecosystem, just took from that), and Google is a double edged sword.

Google uses open source components which is highly advantageous for technical end users (Eg: I can run Linux utilities even on a non rooted Android). But their vendor lock in is second to none but Apple & MS.

"Free for all" is fabulous book...

Rather I have multiple sources;

I don't usually like to use such a service if there is an alternative which can be easily made offline as PDF, HTML or at best, EPUB. And better not require an account..

There are only few good ones on Wikibooks, still they are worth it... Eg: those on C Programming...

You can get some decent sources from university sites... I think I can learn things very quickly from lecture slides + bit of experimentation.

Since almost all things I want to learn are open source, there are always some great resources in form of documentation for me. I often like terse documentation rather than tutorials since it facilitates faster learning if you know how;