On medium builds, sprint to build momentum, and hold forward. This will should enter a dive slide.
Light builds can dive slide without building momentum first.

While landing after a dive, hold crouch to roll as you land.

After dive sliding, jump to get up, and jump again before it ends. This will get you distance.
Light builds will skid on the ground for a moment after landing the final jump.

You can chain dive slide jumps one after the other, just be sure to wait for the skid to end.
Light build exclusive! * as of playtest 2, chaining is not possible as shown

You can flip (side, back, and forwards) by starting a dive, and immediately holding the opposite direction. *playtest 2

Chain flips by pressing jump right before landing (light build exclusive)