SpringBoot and Microservices : Master Microservices with Spring Boot and Spring Cloud : https://www.udemy.com/course/microservices-with-spring-boot-and-spring-cloud/
Android Development : Flutter & Dart : https://www.youtube.com/watch?v=GLSG_Wh_YWc&list=PL55RiY5tL51qKxC472MY2ayxJTze5Qb7T&ab_channel=Academind
Web Development : HTML, CSS, and Javascript for Web Developers : https://www.coursera.org/learn/html-css-javascript-for-web-developers
REACT JS : Advanced React and Redux : https://www.udemy.com/course/react-redux-tutorial/