I'm a self taught developer (of 4 years) and have been working professionally as a developer (working mostly with Python and JavaScript) for the past 2 years.
As an autodidact, I feel I'm lacking knowledge in many of the core principles of software engineering and computer science. I often find myself having great ideas for projects, packages and implementations but find myself running into roadblocks and frustration when trying to express them.
Book recommendations appreciated!
And of course there is the mother of all software books SICP [1] (yes, it's free) – which is often regarded as the CS text book. It is very information-dense and touches on many parts of CS.
However, if you're struggling to build things, I doubt that books will do much good, since they usually cover theoretical aspects. For this I could only recommend lots of tinkering and practice and little half-completed projects, unfortunately.
Do you have some specific examples of projects/libraries where you got stuck? Perhaps we can get a better understanding of what it is you feel you are lacking then...
[0] https://www.cs.nott.ac.uk/~pszgmh/pih.html
[1] https://mitpress.mit.edu/sites/default/files/sicp/index.html