Hi I have some questions regarding account plans

Hi before I start, yes I’ve already checked those hover info boxes but these are some things I’m confused about.

I understand the top one is for the overall account’s disk but I don’t understand the second option, does it mean per domain/website aka virtual server?
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I’d appreciate it if someone is able to tell me what it exactly means.

I think this means number of websites
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But what do these next options mean? do they mean subdomains?
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I don’t understand what alias and non alias servers are.
I’m guessing alias means example.net example.com which is mentioned here


but what about non-alias? does that mean like subdom.domain.com?

Sorry I’m just a little too dumb sometimes, don’t mind me much.

Thanks again for the help.