Quick-fire questions
Can I connect a Studio Display to a TB3 dock?
> All good Thunderbolt 3 and 4 docks and hubs should support a connected Studio Display fully, and provided the Mac connected to it is running an appropriate version of macOS, its firmware should be updated as part of Software Updates on that connected Mac.
How to connect more TB3 devices to MacBook Air?
> Regular Thunderbolt 3 docks don’t offer more than one Thunderbolt port; to get more ports than the one used to connect to your Mac you need a Thunderbolt 4 hub, offered by the likes of