AEM cloud and dispatcher config questions.

We know apache config.

The directory structure under oursite.dispatcher.cloud contains some seemingly duplicate files / dirs, and several unknown ones.

We are struggling to find any documentation (at least google finds almost nothing).  Any tips on where to look?

AEM has the following structure:

conf.d

- available_vhosts

-- default.vhost

- enabled_vhosts

-- default.vhost

-rewrites

-- derault_rewrite.rules

-- rewrite.rules

- variables

- dispatcher_vhost.conf

conf.dispatcher.d

- available farms

- cache

- clientheaders

- enabled_farmes

- filters

- renderers

- virtualhosts

Questions:

1. 1. What is the difference between conf.d and conf.dispatcher.d?
2. 2. What is dispatcher_vhost.conf for if there are already vhosts conf files under "enabled_vosts"?
3. 3. Why is there a separate directory for rewrite rules, when they should be in individual vhosts files?
4. 5. what is variables for?
5. 6. Are there any documented examples for configs for these files?
6. 7. why are there virtual hosts under conf.dispatch.d(with "any" extension)  and also under conf.d (with vhost extension)?  Which should be used and why?
7. 8. what are farms, and where is the documentation for how to configure them?
8. 9. what are renders, and how should they be configured?