Introduction
The lesson video is the following
Main position
In this lesson we have seen how to manage the corner enclosure with the knight move 4-4 2-5.
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The idea in black response is to be as light as possible. Indeed, strong response will usually be better for white.
The main variation
The normal move for black is to lightly jump to the side.
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From there, white has three choices, enlarge the corner with A, pincer with B or tenuki (shown with C).
White enlarge the corner
If white wants to take the corner, black should ignore and take the side.
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White corner is quite good, but white had to invest 4 stones and black only one. On the other hand, black got to settle on the side and to start an invasion on the top. So both are satisfied.