Most of our knowledge of evolutionary tracks comes from stars found in?

Answer 1

I'm not really sure what this question is asking. Evolutionary tracks of what? Stars? Are you talking about the life cycle of stars or the evolutionary ch ages between generations of stars?

We get a lot of information of the evolution of stars by observing those in globular clusters. These are generally very old stars that are almost all hydrogen and helium and have been burning since the universe was young. They are for the most part Population I stars in that the material in them has never been part of another star system. Younger stars that are of Population II or later are composed of heavier elements that were formed in their predecessor star. So those in the globular clusters give us a "snapshot" of how a star operates and how they evolve with each generation.