I'm sometimes read DC comics. I read this without thinking much about the structure of this. DC Multiverse turned out to be more complicated for me than I thought. So I have a few questions about this:
1. What was the structure of the multiversum before, during and after The Crisis and in particular eras (Golden Era, Silver Era, Bronze Era)? How much worlds multiverse had in pre-Crisis, during Crisis and post-Crysis?
2. Is there a list of all DC Realities(comics, tv serials, films, defunct, existing, destroyed, crossovers in one word all that was created by DC)?
3. Suppose that I'm starting reading DC comics from the start (from first pre-Crysis comics). What order should I follow of course if it is an order in this?
4. What is flashpoint?