The first video describes the basics of the finesse and is designed for a beginner.
The hand in the second video shows the finesse in action.
The hand in the third video is similar to the second video, but with a bad trump split.
The fourth video indicates why finesses are usually more likely to be successful than trying to drop the opponents’ high cards. It is an introduction to bridge probabilities.

The Basics

A Hand Where Some Finesses are Taken

What if East has Four Spades