First, we have to be clear about what you mean about the term "mythology" since it is used in a variety of ways - referring to a body of literature from the ancient world or referring to the belief systems and folklore of third world people. The latter definition is tainted with racism and not the preferred definition, but people nevertheless misuse the word in this way.

I assume you're talking about literature from the ancient world. This is analyzed by literary scholars for their literary merit, by historians to understand aspects of ancient cultures, and by folklorists to assist with efforts to conduct comparative studies, drawing on historic documents to demonstrate older forms of oral traditions.

Breaking this down should help you to understand the direction(s) you need to take your research. There are worlds of material for each of these approaches. Depending on the direction you wish to take, perhaps someone can recommend popularized websites and videos that you can consider.