really silly q, but ... apple Id

[bluebird3]

What are the benefit of getting one?

Also... iCloud vs time capsule ?

Mail is just a software that can use any email address/program yes such as yahoo, gmail?

What's Mac.com ?

 

[simsaladimbamba]

What are the benefit of getting one?

Syncing between Macs and iOS devices is easier when it comes to bookmarks and such.
You can use the iTunes Store, App Store and Mac App Store.

Also... iCloud vs time capsule ?

One is via your internet connection and is limited by the available upload speed, but it is not at your home.
The second is a local network HDD to backup to.

Mail is just a software that can use any email address/program yes such as yahoo, gmail?

Yes, but Yahoo does not like it very much in my experience with four Yahoo addresses.

What's Mac.com ?

And outdated website address. Click on it and you see where you land.