Tutorials App Concept UI

Hello Guys
Today, I am presenting a concept app for Online Courses. I tried to create something new on course details screen where we have menu on the left side as tabs while on the right side we have the video preview. In the bottom we have add to cart functionality while in the middle there is summary for what is being offered in this course.

Please share your feedback and tell me what do you think about this concept.

Thanks.