The basic format of Khan academy is providing two videos per topic, an easier example and a harder example. It has come to my notice that this does not cover the whole topic. For example: under the Topic Arc, Arc lengths and Trig functions, there are videos on Arcs and Arc lengths but not trig functions.

Khan academy has plenty of videos explaining trig function but one has to search and find the video pertaining to the topic which takes time

what I propose is to add a link for each question that provides an example of that same type of question instead of generalizing the whole topic to just two videos.