How can one become a scientist, an economist, a historian...? Does it simply involve reading many books on the subject? Does it involve observing, thinking and doing experiments?

Please give me an answer for this

Dear Student,
To become a scientist, an economist or a historian, it of course requires a lot of hard working, dedication and studies in the respective subjects, but it also requires a proper education and certification from a recognised university. Also, as you have mentioned above;  observing, thinking and doing experiments are required to achieve greater positions in these fields.

Hope this solves your doubts regarding this query.

Regards