Master Chen Zhonghua talked about the fire schedule (火候). We have to be ready to receive the information at the right time. If we miss the opportunity, we will never get it.
Against the bigger/stronger opponent, we must hold our ground, and look for the dot in the opponent. If that dot is moved, they will have no power anymore.
Against the smaller/weaker opponent, we will not fear, and we must obtain absolute dominance. Basically, on the touch, the opponent already knows that they have lost.
Peng is the energy that you are strong enough to withstand the opponent's power, and hold your ground.
The eight technique only exists from the start point of having the peng energy.
Peng is also the technique that push forwards and hold the opponent in front.
Lu is the technique that pulls the opponent backward.
Ji is the technique that pulls yourself forward toward the opponent to take up any space created.
Peng and Ji one after another create the worm action.
An is the technique that separates the opponent from you, and it can go up, down or forward.
Cai is the technique that plucks something off the opponent without allowing the opponent to move.
Lie is the technique to split.
Zhou is not the elbow, it is a technique to create a warp.
Kao is the technique that slams a body part into the opponent.