Hello Nitay
For the time being, the only content for wireless is what you see in the CCNA course (Unit 3.4) and the ENCOR course (Unit 3).
If you have suggestions for expanding this content, please feel free to go to the Member Ideas page and make your suggestions. You may find that others have also made these suggestions, to which you can add your voice.
Yes, the MBSS topology is indeed a different from a repeater, however, the concept is the same. The MBSS can be considered a glorified repeater in that it wirelessly extends the coverage area, but has additional intelligence that allows the wirelessly meshed devices to reroute traffic between APs, essentially “healing” the topology if a failure takes place. A repeater cannot do this.
Ideally, a wired access point with the same SSID is the best way to extend the range of an SSID to create an ESS. However this is not always possible, so one way is using a repeater, the other an MBSS, and a third option is using a point to point connection, using two additional access points, to essentially create a wireless bridge to which the remote access points connects. This extends the network wirelessly to the remote access point, but from the point of view of the access point, it looks like a direct wired connection.
I hope this has been helpful!
Laz