This faucet works like a sink cartridge faucet and repairs are similar.
If water drips out the spout or seeps out around the handle, buy a kit and replace all the rubber parts. Inspect the cylinder and replace it if you see signs of wear. If your model has plastic rather than ceramic disks, replace the entire unit.
Depending on the model, you may need to partially disassemble the cylinder to get to all the rubber parts.
An hour or two for most repairs
Screwdrivers, adjustable wrench, groove-joint pliers, cleaning brush
Shutting off water, dismantling a faucet, installing small parts
Shut off the water, close the tub stopper, and place a rag in the tub to catch any parts
Repair kit for your model of faucet, silicone grease