what do u mean by regulated device?
What are some dangers/challenges that a beginner may face when using a mech mod?
A regulated device is something like a Provari, zmax, vamo, or any of the iTaste devices(I'd pick one with a removable battery over the MVP, but that's just my preference). They have safety features that make sure you can't do anything really bad to yourself, because the voltage flow to the atomizer is controlled by a circuit board instead of just discharging straight from a battery in to it like a mechanical.
The dangers a beginner faces with a mechanical is that they don't know the dangers. For instance, you NEED to know about coil safety, Ohm's and Watt's law, battery safety, etc. Using prebuilt heads on a mechanical means you are trusting some mass production factory not to make a single mistake with a coil that will turn your mechanical from a vaping device into a red hot, nauxeous gas spewing pile of fun.
If you aren't going to learn all that, you need to learn about inline fuses or a regulating board like the kick and USE them, every time.
Don't get me wrong, I love mechanicals, and some people with no idea what they are doing run around with one and never have a problem, but that doesn't mean something terrible can't happen.