Alternatives to Feedburner

This is sort of covered in many posts and web pages, but I apparently don't really understand RSS.

For many years, I have used the very easy (as usual for Atahualpa) Feedburner setup BFA provides. Like many others, I have been unable to get into my Feedburner page since Google took them over and then stopped support. So I'd like to switch to something else. A few question; please pardon my ignorance:

0. Is there a forum post or page that explains all of the items below, so I don't waste people's time?

1. Does Atahualpa support any other RSS feed mechanisms?

2. If I delete Feedburner settings from BFA theme options, will e-mail signup still work?

3. Can people here recommend a most-compatible plugin for RSS browser feed and e-mail subscription?

4. Is it necessary to sign up with a service like Mailchimp to find out who has subscribed to RSS or e-mail feeds?

Thanks in advance.