At first, I was also confused by the various indices. Simply put, this index shows when altcoins start growing faster than Bitcoin.So, if many coins have shown better growth than Bitcoin over the past few months, it means that money in the market is moving into altcoins. The alt season index usually shows this on a scale from 0 to 100. High values indicate active coin growth, while low values indicate Bitcoin dominance. I use this indicator as an additional guide for trading to understand where the market is moving. By the way, when I was looking for information about this index, I found many explanations on the website itrusty.io. There is a lot of interesting information. I recommend taking a look.