Simson Leigh

I've also recently started teaching my kids basics of coding and recommend all of the resources listed above.
My recommendations for books include:

"Computational Fairy Tales" by Jeremy Kubica - This is a book that explains problem solving using algorithms and data structures in a way that is easy for kids to understand.
Hello Ruby series - Educational story and activities to learn coding.
Young Rewired state books - Story driven way for kids to learn for example HTML, CSS, JavaScript, etc.

The other activity that we are doing is using CodeMonkey to learn basics of game programming.

I am currently reading "Spring in Action" Fifth Edition by Craig Walls and recommend it as a good introduction to Spring and Spring Boot. Some of the code examples have minor errors, however the corrected code can be found on Github (https://github.com/habuma).