You can create up to 4 SSIDs per band (of course, including guest)
You can limit speed on a group of devices (organized in profiles). You can assign named devices to any profile you create. Unnamed devices are automatically assigned to the Default profile. There are multiple ways to set controls. C.f., https://www.pcwrt.com/2020/01/how-to-allow-or-block-web-sites-on-the-router/