Hello I am new and I want to develop wp theme and sell on themeforest. So please any guidelines?which frame work is used to develop wp sites?

Envato Authors Theme Authors
2

Hello @ntdropper and welcome!

I am not sure about the best framework to use - at this particular point, Themeforest authors will be able to help you better, but meanwhile, also please read this important announcement about the updated WordPress requirements for Themeforest and Codecanyon: Updated WordPress Requirements

All the best!