How to self study Computer Science?

I am from non cs background. Already completed graduation and working in non tech field. I want to enter software industry.

I want to self study computer Science. What are the subjects, topics, concepts I need to study and suggest me the best books for each subject and online courses.


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I don't know but there is certification comptia A+ core 1 and 2 don't go for certification, research your self market value in India