It all depends on how you run your network. Valid SSIDs are your own wireless access points that are connected to your controller. Optionally, if you are running third-party access ponts that are not on your controller, you can mark them Valid too. Why is the important? If you run very strict IDS/IPS implementations, your access points marked "Valid" will be left alone.
Interferring access points are access points that are in the air, but are unclassified and NOT rogue access points. Why is this important? We have a knob in our IDS profile that does NOT allow Valid or Corporate users to roam to Interferring APs so that you are not troubleshooting people who roam to starbucks, or happen to connect to what they think is the same Linksys at home.
Known Interferring is a classification that is always manual and it is for people who are trying to keep track of the APs that are not on their network, but interferring. Retail establishments, for PCI compliance must identify all of the access points in their environment, even if they do not have wireless. You can change an access point from interferring to "Known Interferring" when you have identified it, as a check mark to satisfy this requirement. A known interferring access point is not much different from an interferring access point, because if you are trying to keep your Valid users off of them using the knob above, that will still work.
Rogue access points are access points that are detected as being on your wired as well as wireless space. They can be identified as Rogue by the controller, or manually classified so by the administrator. Devices that attempt to connect to rogue devices can be stopped automatically or manually by the administrator.
I hope this helps.