If you need to force connection to a specific band you have to have a unique SSID for each. I keep separate SSIDs to force connection to the band I want. If I'm on 5G and start having distance issues I'll manually switch to the 2.4G band. I have a couple of locations in my house that are a bit flaky for 5G but I don't want an automatic switch to 2.4G. I've also seen some lesser radios not switch well and get stuck on 2.4G even if they support 5G. That's really not too common these days so really shouldn't be much of an issue but it can happen.
For most people a single SSID is best as it reduces confusion.
*Do* enable Guest SSID (if available) with its own password to keep visitors off your main network. If you don't manage their device(s) and don't know how well they guard against virus/malware you don't want their devices to see yours.
For most people a single SSID is best as it reduces confusion.
*Do* enable Guest SSID (if available) with its own password to keep visitors off your main network. If you don't manage their device(s) and don't know how well they guard against virus/malware you don't want their devices to see yours.