From Hard Drop Tetris Wiki
Situational
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Opposite Lid
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Keep an eye out for ways to create covers from the other side when you get pieces in a different order.
Covering with I can also be effective, but be wary when using L, J, or O; covering with these pieces can create unwanted hanging points or fill the space where you intend to form a hole.
Imperial Stairs
Look for this |
Fill with S |
In the case that you have an open imperial cross or T shape, fill it with S/Z finish a hole and start another.
Cover with Z |
Build stairs with T |
Cover holes with S/Z to create the foundation for new holes.
Place T next to this foundation to complete the hole and start a new one.
Hangs
Hanging points are structures that impede the direct creation of holes; pieces must instead be placed in so they are "hanging" from this structure in order to create a hole. Using O, L, or J to cover a hole have the highest potential for creating hanging points. A line clear may be necessary to continue, but sometimes "hanging" structures can be useful in quickly creating multiple holes with few pieces.
If the structure is 3 units tall, only L/J can be hung from the structure and complete a hole, making a line clear the best strategy.
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If the structure is 2 units tall, all pieces but I can be hung from the structure to complete a hole. A few pieces will maintain the 2 unit structure, while a few will necessitate a line clear. T can successfully end the hanging structure without requiring a line clear.
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In this diagram, O starts the structure and J and S maintain it. Z and L could have been used to end the structure by clearing a line, but T caps off the structure without a clear.