There is almost no learning curve. Attach your cartridge to the battery and make sure it’s charged. Most devices require you to press the fire button five times. Some devices are draw-activated while others may require you to press a button to vape. If your device allows you to adjust the voltage, start at the lowest possible setting first. Begin with small 3-5 second puffs so you can gauge the potency of the oil, and the THC effects. You can always take another puff, so don’t overdo it. Experiment with raising the voltage for a stronger hit, but if it starts to taste dry or burnt, take it down a notch before you damage the coil. Most cartridges can be refilled with your own Jungle Boys, Muha meds, THC oil, CBD vape oil or e-liquid before you need to get rid of them. If it’s a 510 style cartridge, just unscrew the mouthpiece and fill the tank up. You may need to use a syringe for accuracy.