There are many indices you can track but it can be confusing and overwhelming. Just use Fyers Web pre-defined watchlists. They show you all the main indices and the stocks in those indices. Very good feature.
There is one watchlist called 'Nifty Indices' in Fyers web pre defined watchlists. Here, you will get charts of all the indices. Nobody else is providing this. It's an easy way to track price and trends across sectors.