This is a quick guide to a video series:
This series (authored and recorded by 5 of our authors working together) starts out with material appropriate for an absolute beginner but over the course of 10 videos gets increasingly advanced.
The videos are focused on the weakness of the f2 and f7 squares, which, especially in king-pawn openings, are often extremely vulnerable until a player castles. This series in particular shows a lot of tactics. For a beginner it would be helpful to watch a few other opening videos before going past the second Weakest Square. They could try The Rules to the Opening and Think like a Master: The Opening.
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The Weakest Square 1: introduces which square is the weakest for white and black, and why that square is weak.
The Weakest Square 2: an exciting example where white attacks black's weakest square and black attacks white's weakest square!
Here's where the video series switches to "intermediate" level, in other words about 400+. A lower-rated player can definitely keep going from here if they enjoy the series, but again, I'd suggest they check out The Rules to the Opening and How Masters Think: The Opening first.
The Weakest Square 3: a famous queen sacrifice! This shows the students that attacking the weakest square can often lead to checkmate, which is so important that you can make sacrifices to get there.
The Weakest Square 4: Next up for the student of the weakest square comes an example of how weak squares can lead to an incredible tangle of knight forks.
The Weakest Square 5: The tactics and tricks are getting more complicated, but they still are all about the weakest square. Hopefully the student can start to predict some of the cool attacks we are seeing, like this awesome queen sacrifice for checkmate!
The Weakest Square 6: Usually, one of the best ways to cover the weakest square is to castle kingside, and let your rook defend f2 or f7. In this video the student will see that it is still possible to strike at that square even after castling.
From here on, the videos are appropriate to advanced (800-1200) students as well as intermediates. Any student who has watched and enjoyed 1-6 should be able to continue on regardless of their rating.
The Weakest Square 7: Usually, you need several pieces working together to create a successful attack. The particular weakness of f2/f7 at the start of the game allows for some surprising attacks with only 2 pieces, like the one shown here.
The Weakest Square 8: Here we see an opening disaster on the weakest square that befell one of chesskid.com's content directors, IM Danny Rensch, when he was a chesskid.
The Weakest Square 9: Here Amanda shows a sharp variation in which white sacrifices a whole Rook in order to pounce on the weakest square.
The Weakest Square 10: IM David Pruess shows us the first part of a very exciting game played by his own student, featuring many crazy attacks for both players on the Square of Doooooooom.
The Weakest Square 10, part 2: the stunning conclusion of this amazing game.
The Weakest Square BONUS: a ChessKid sent in a game that he played which featured an amazing sacrifice on the Weakest Square. The PinkHamster had no choice but to analyze this ChessKid's beautiful game.
The later videos in this series were some of the most advanced and challenging material we have about the opening phase so far on chesskid. If you notice that your students found the many attacking possibilities in these videos exciting, a great series to point them to next would be Crushing the Castle, which also contains a ton of attacking ideas. The series is layed out a bit like this one with a bunch of ideas illustrated by example games; the focus is on g7 and h7 rather than f7, and the series gets quite advanced, while keeping the explanations clear.
Another good series to check out is The Fried Liver Attack, which explores a famous opening, "The Fried Liver" in which white attacks black's Weakest Square ferociously in the first few moves of the game.