Question

which is the best subject for lecturing​

Answer 1

You should follow your dreams. You should do which interest you. You should select wisely. See all subjects and then decide which one to select according to your likes and dislikes.

Simple example is that if you like languages opt arts else for commerce.

Personally, I would prefer commerce. But don't decide on my basis. if you have confusion than set priorities and select the best for you.

All the best. :)