It takes data from a few different APIs and websites... on one of my past posts I have a video of my cryptocurrency tracker application and the features it has, however it was a couple of months ago so its a little outdated, but it explains the application in a bit more detail than I have here :) I've heard the sentiment indicator is the most important one though and that one was the hardest to implement and it still requires some manual intervention of downloading charts in order to get the most accurate data