Right now seems to be a big dip. Not sure how much further it will go down, but right now most coins have attractive prices. What are the best / hottest ones to coin in your opinion and why?

I know that various sites perform measurements of cryptocurrency correlation with BTC. Is there a site that provides an analysis of the correlation of a cryptocurrency with the entire crypto market?

I am currently trying to figure out what are the available index funds in the cryptomarket space. Is this list complete https://en.bitcoinwiki.org/wiki/Index_Fund ?
The idea is to invest in an index fund, since you dont know which coins will perform better, but believe that the crypto market will gain overall. So an index fund is the best way to invest then. Any thoughts are welcome!