So other investors holding that stock, are out there willing to pay him cash, for his promise to buy their stock if it's share price falls to a price below an agreed to "strike price"? If that is how it works, why would a stockholder pay money for that? I[...]

Thanks, I have no idea what that means. Also, I can't understand how if this was what he was doing in the video, how he could open an app on his phone, and in real time make a few clicks and see hundreds of dollars instantly appear in his account. I gues[...]