I wiped everything on my phone with TWRP. What should I do? I wiped everything on my HTC 10 device using TWRP (I checked everything). My device was rooted. Now how can I get the device working properly again? I think that I don't have anything on the device (and on the external sd) but the TWRP.
With proper driver and ADB installed, sideload another ROM from your PC using ADB sideload, available in Advanced menu.