Originally Posted by rm -rf

Tubeless Compatible just means that the rim can be sealed air tight when a tubeless stem is installed, so it's ready to use tubeless tires. (most rims have holes where the spokes are mounted, and just the tube keeps the air in.)

But it probably comes with a tube, and that works the same as any other wheel & tire.
EDIT - from the bikes direct page:
add your own tubeless strips, fluid and valves and ride faster/lighter and virtually flat free
So it just has normal rim tape that's not air tight, and has a tube. You'd have to buy aftermarket rim tape, valve, and fluid for tubeless and install it carefully.

The WTB Nano 40c tires are good, but they have knobs. If you are mostly riding on pavement, you might want to get non-treaded tires, or tires with a more filled in center section. That's faster and less effort on the road.

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For tubeless use:
You will likely need a tubeless designed tire, these have the correct bead shape and resist air filtering through the tire itself. (but some riders have used "normal" tires sucessfully.)
The tubeless stem is attached to the rim.
The tubeless tire is mounted--this often needs an air compressor to pop the beads in place before the air leaks out from under the edge.
Sealant is added through the valve after the tire's beads are mounted to the rim.

The sealant plugs small holes as you ride. (this is really useful in places that have goathead thorns!) But big cuts won't be sealed byt the liquid. You'll want to carry a spare tube to be installed to get you home.

Sealant get dried out after a year or so, and needs to be cleaned out and replaced.

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Riders like the tubeless ride. With no tubes, it's often a smoother ride, since the tire can flex easily. But these are usually fairly expensive tires.

And you don't get pinch flats, where the tire bottoms out against the rim, and the tube gets cut by being mashed between the tire and the edge of the rim. So tubeless tires can safely run at lower air pressure for a plush ride.

The downside is more maintenance and the difficulty of mounting a tire with just a bike pump.