Get Involved/development/Learn

C and C++

If you were to read only one book, then that would be "Thinking in C: Foundations for Java & C++" by Bruce Eckel and Chuck Allison https://archive.org/details/ThinkingInC https://www.youtube.com/watch?v=W5lNRCxy-N0

Other resources:

"C Programming Tutorial for Beginners" by Mike Dane and freeCodeCamp.org https://www.youtube.com/watch?v=KJgsSFOSQv0

"Thinking in C++" by Bruce Eckel https://archive.org/details/TICPP2ndEdVolOne https://archive.org/details/TICPP2ndEdVolTwo

"C++ Tutorial for Beginners - Full Course" by Mike Dane and freeCodeCamp.org https://www.youtube.com/watch?v=vLnPwxZdW4Y

KDE Frameworks

"Getting Started with KDE Frameworks" https://develop.kde.org/docs/use/kxmlgui/ https://www.youtube.com/watch?v=YQBCmVPmDmc

"Getting started with Kirigami" https://develop.kde.org/docs/use/kirigami/

Other resources:

https://develop.kde.org/docs/use/