(Data Analysis and Algorithm)
https://www.javatpoint.com/daa-tutorial
(Full video on DAA)
https://youtu.be/D6Q_wHrzxDs
(Java OOPS concept)
https://www.javatpoint.com/java-oops-concepts
https://www.geeksforgeeks.org/
object-oriented-programming-oops-concept-in-java/
https://www.freecodecamp.org/news/object-oriented-programming-concepts-21bb035f7260/
(Java OOPS video)
https://www.youtube.com/watch?v=7GwptabrYyk
(Operating Systems )
https://www.javatpoint.com/os-tutorial
(OS video) https://www.youtube.com/channel/UCQYMhOMi_Cdj1CEAU-fv80A
(Data Communication /Computer Network)
https://www.javatpoint.com/computer-network-tutorial
(DC/CN Notes)
https://ncert.nic.in/textbook/pdf/lecs111.pdf
(OSI model-DC/CN)
https://youtu.be/vv4y_uOneC0
(micro controller website )
https://sites.google.com/a/gmit.ac.in/18cs44/
(All in one computer science video channel) https://www.youtube.com/channel/UCM-yUTYGmrNvKOCcAl21g3w
https://youtu.be/YoXxevp1WRQ
(Aptitude)
For Practice:- https://leetcode.com/
https://youtu.be/N1Ak5RSAFww
https://www.geeksforgeeks.org/must-do-coding-questions-for-companies-like-amazon-microsoft-adobe/?ref=leftbar-rightbar
(How to get internships )
https://youtu.be/wYYUf6eq96E
(Coding questions )
https://towardsdatascience.com/two-of-the-most-famous-coding-interview-questions-9746a4111011

(Web Development)
https://www.geeksforgeeks.org/what-is-full-stack-development/
(Kotlin)
https://youtu.be/mnkzx3TwbV8

(Web Browser for Development )
https://www.mozilla.org/en-US/firefox/developer/