Livros de anotações grátis de várias linguagens de programação

Aqui está um site cujos autores desconheço que oferecem PDFs de livros acerca de várias linguagens de programação.

Destaco os seguintes:
Algorithms Notes for Professionals book
Android™ Notes for Professionals book
C Notes for Professionals book
C++ Notes for Professionals book
C# Notes for Professionals book
Entity Framework Notes for Professionals book
Git® Notes for Professionals book
HTML5 Canvas Notes for Professionals book
Java® Notes for Professionals book
JavaScript® Notes for Professionals book
jQuery® Notes for Professionals book
jQuery® Notes for Professionals book
Kotlin® Notes for Professionals book
PHP Notes for Professionals book
TypeScript Notes for Professionals book
+infos(oficial): https://goalkicker.com/

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