Can i Ask?

Question

How to become Android/IOS or Windows-PC developer?

How to become Operating Systems (O.S) Developer?

Answer 1

If this question is just for knowledge it's fair otherwise you need to focus on particular feild not the hole IT industry. Android,iOS and windows are different platforms with different methodology. So focus on your clear path don't waste time on useless things that doesn't make any sense for your programming career especially if you are a begginer.

Answer 2

You should alwayse use search before posting any questions.

For Android/IOS:-
https://www.sololearn.com/discuss/2325500/?ref=app

For OS Dev, You can learn C and C++ but still its a long way to go you also have to read about OS fundamentals.