Computer science is the study of algorithmic processes, computational machines and computation itself. As a discipline, computer science spans a range of topics from theoretical studies of algorithms, computation and information to the practical issues of implementing computational systems in hardware and software.
START WITH BASICS
Start with basics of IT. See how computer works , identify the basic part of a computer. Start using a operating system and do work on it. Start learning microsoft office applications. Then see how internet works start searching on browsers to learn more.
Also start learning database like Oracle , SQL , MongoDB etc. Make projects with programming language + database combination. DBMS mini project is best for those students in the field of computer science or Information Technology.
Want to a software developer then pursue a Computer Science or Information Technology degree and learn Programming Languages + Data Structures (in c++/java) + Operating System + System Design + do some Internships.
MOBILE APP DEVELOPER
Want to be a mobile app developer then go with java/Kotlin (Android Studio). You can also explore mobile development frameworks like Xamarin, React Native etc. For both Android and ios you can learn flutter.
Want to be a Ethical Hacker then start exploring Operating System , Networking , Programming Languages , Cryptography , Linux , Reverse Engineering , Database etc.
DON’T LIKE PROGRAMMING
If you don’t have interset in programming. You think that this codding and all is not for me I can’t do it then you can explore fields like Networking , Data Analytics , Search Engine Optimization , Software Quality Testing , Digital Marketing etc.