If you find the right audience, your audience will believe you are talking directly to them like you already know them. Makes you seem relatable, and basic human nature will drive them to get to know you, who you are, and what do you do.
Videos work well because you can not only use them to go fishing for customers but also you can use them to teach fish how to bite, creating a bigger market for what you do with little or no extra effort.
How do you know what you don’t know? Google it. But the 2nd biggest search engine in the world is YouTube.