> Is there a similar source for Southern Indian (Carnatic) music?

https://www.ragasurabhi.com/ is decent.

> PS also any good sources for watching performances?

- First Edition Arts has similarly high-quality videos: https://www.youtube.com/@FirstEditionArtsChannel

- Madras Music Academy: https://www.youtube.com/@themusicacademymadras/videos

You can follow some of the artistes themselves, such as:

- TM Krishna: https://www.youtube.com/channel/UCl-HdkpIxPECiTpxWSaVHqA

- Sanjay Subrahmanyan: https://www.youtube.com/@sanjaysubmusic

- Dr L Subramaniam: https://www.youtube.com/channel/UCdYNQApXy7MN4ynEzWf1HlQ

- Dr Jayanthi Kumaresh: https://www.youtube.com/channel/UCW7OT_-mpbTu3OcS9VwCtUQ

- Sangeethapriya, audio recordings only: https://www.sangeethapriya.org/display_tracks.php

In addition, karnatik.com has a very nice directory of concert music by well known composers, featuring lyrics, raagam and taalam, along with some other information that changes from piece to piece

You might be interested in this youtube channel:

Rishabh Bhowmick https://www.youtube.com/@RishabhB/videos

"How to Listen to Indian Classical Music" is a common subject discussed on that channel

This is from long ago (1989+), but I read it recently: "A Carnatic Music Primer" by P. Sriram (https://sanskritdocuments.org/english/carnatic.pdf / http://www.ae.iitm.ac.in/~sriram/karpri.pdf)