At the time of writing, only the beta Steam client supports DualSense, so you need to switch the Steam client to beta first. Click 'Steam' displayed in the upper left of the Steam client, and click ...

The official Sony DualShock 4 USB wireless adapter is the simplest Bluetooth option. You may have to hunt for it or spend a little more than you would on a standard Bluetooth dongle, but it's worth it ...

Connect the ps4 controller to your pc via bluetooth online, How to use the PS4 DualShock 4 controller on a PC TechRadar online ...