How do people make those videos where photo starts talking? what’s the tool they use?

I find it very hilarious when those meme guys make monalisa talk, like a still with lips moving like its really talking. Some of them really look real like the person is really speaking but others …damn completely cursed, melting teeth, mouth all over the place.

How are people making the good ones? Is it one tool or a combination ,and is any of it beginner-friendly, or do you need to be technical?