Quick answer: To charge an Apple Pencil, connect it to your iPad with Bluetooth on. A 1st-gen Pencil plugs into the Lightning port (or a USB-C-to-Apple-Pencil adapter); a 2nd-gen or Apple Pencil Pro snaps magnetically to the right edge of the iPad; and a USB-C Pencil charges with a USB-C cable.
There are four Apple Pencil models, and each one charge...