Books
In my humble opinion, and based only on my observation, reading technical books is not among the highest priorities for most software developers.
This is a shame because books are an invaluable source of wisdom.
I love reading, especially technical books that help me get strong Software Engineering foundations. I believe that learning the fundamentals of Software Engineering is a great investment. First, it allows you to build quality software; that is, software that is well-crafted internally and also meets the needs of the user. Second, having a strong foundation allows you to learn new languages and frameworks faster; therefore, it is a great way to deal with the fast pace of technological evolution.
This is the list of books that I have read from cover to cover:
The Algorithm Design Manual. Steven Skiena (2008)
Head First Design Patterns. Eric Freeman, Elisabeth Robson, Kathy Sierra, Bert Bates (2014)
Clean Code: A Handbook of Agile Software Craftsmanship. Robert C. Martin (2008)
Test-Driven Development by Example. Kent Beck (2002)
Agile Software Development: Principles, Patterns, and Practices. Robert C. Martin (2002)
Design Patterns: Elements of Reusable Object-Oriented Software. Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides (1994)
Clean Architecture: A Craftsman's Guide to Software Structure and Design. Robert C. Martin (2017)
The Clean Coder: A Code of Conduct for Professional Programmers. Robert C. Martin (2011)
Patterns of Enterprise Application Architecture. Martin Fowler (2002)
XUnit Test Patterns: Refactoring Test Code. Gerard Meszaros (2007)
Code Complete. Steve McConnell (2004)
Accelerate: The Science of Lean Software and DevOps. Nicole Forsgren, Jez Humble, Gene Kim (2018)
The Software Craftsman: Professionalism, Pragmatism, Pride. Sandro Mancuso (2014)
The Annotated Turing. Charles Petzold (2008)
Introduction to Algorithms. Thomas Cormen, Charles Leiserson, Ronald Rivest, Clifford Stein (2009)
Domain-Driven Design: Tackling Complexity in the Heart of Software. Eric Evans (2003)
Agile Estimating and Planning. Mike Cohn (2005)
Working Effectively with Legacy Code. Michael C. Feathers (2004)