Highly recommend videos from Anuja Kamat:

What is Raag? => https://www.youtube.com/watch?v=CBtFt3HUkT0

Concept of 'Swara'- Hindustani, Carnatic and Western theory of swara => https://www.youtube.com/watch?v=J-nUTYRyuqk

(the entire video series has a nice, casual way of explaining things. Grab a coffee and enjoy)