HTML https://www.freecodecamp.org/learn/2022/responsive-web-design/learn-html-by-building-a-cat-photo-app/step-1

CSS https://www.freecodecamp.org/learn/2022/responsive-web-design/learn-css-transforms-by-building-a-penguin/step-1

SQL https://sqlbolt.com/

Postman https://academy.postman.com/path/postman-api-fundamentals-student-expert

ISTQB https://isqi.onlineexams.de/

JAVA https://play.google.com/store/apps/details?id=com.fundamenta.edu.app