If anyone knows any books or video lectures that explain QM and QFT in a simple way, with more focus on the ideas and concepts behind it than the details of calculus. I need to conceptually understand QM and QFT, and the ideas behind the calculus: what it means and what we are doing with it, but I don`t need to solve equations. 
It is for a theoritical research I am doing, not for exams.