It can be a little difficult at first to understand the value of a dock, but once you start using one (assuming it’s a good one) it does quickly become an indispensable part of the setup. The Kensington SD5900T Thunderbolt 4/DisplayLink Dock is a good one. The name is both self-explanatory and also the dock’s key sales pitch: It’s got a lot of ports, including Thunderbolt 4. It will, in fact, allow you to connect up to four external 4K monitors on supported systems thanks to the combination of the Thunderbolt and DisplayLink technologies. This is usually difficult to do…