The Passionate Programmer is still high up in my list. It's more about ways to get better at software engineering, and less about specific tools or technologies.
Depending on the tech stack you're interested in, I would also strongly suggest reading foundational books that go deep into that platform (e.g. the Java Language Specification if you're into Java [1]). These are not things you necessarily need to read end-to-end or understand completely, but your global understanding of your chosen platform will expand significantly.
Systems Performance by Brendan Gregg is another useful classic. While it's about performance, it touches upon a huge number of important topics (from memory allocation to pretty graphs), perusing it will make you smarter.
Depending on the tech stack you're interested in, I would also strongly suggest reading foundational books that go deep into that platform (e.g. the Java Language Specification if you're into Java [1]). These are not things you necessarily need to read end-to-end or understand completely, but your global understanding of your chosen platform will expand significantly.
Systems Performance by Brendan Gregg is another useful classic. While it's about performance, it touches upon a huge number of important topics (from memory allocation to pretty graphs), perusing it will make you smarter.
[1] https://docs.oracle.com/javase/specs/