septillion:
H-bridges, or better two H-bridges, are commonly used with steppers. But you can use them for a DC motor as well. The module you like has 2 H-bridges on it. Both can do 800mA. It differs from a L298 in that it does not provide an enable line so you can't freewheel.
No, with steppers current-controlling stepper drivers are commonly used these days as most
steppers are low-impedance bipolar and voltage-drive is not reasonable for them. But we aren't
talking about steppers!
A lot of the dual H-bridges do say they can drive a stepper, but really that's confusing and bogus,
no-one does it that way for decades.