A Guide to the How-to-Tetris YouTube Tutorial Videos
Introduction
Once you have grasped the fundamentals of stacking and downstacking, it is time to move on to more intermediate-level setups.
Unlike my beginner video segment, I have far more early- to mid-intermediate-level tutorial videos.
This section includes videos demonstrating core mid-game techniques, such as follow-ups, 6-3 stacking, and general T-spinning methods, depending on which lane the main Tetris line is in.
Sustaining T-Spins During 9-0, 8-1, 7-2, and 6-3 Stacking
When the garbage or main Tetris hole is in certain columns, specific kinds of T-spins exist to optimize your T-spin efficiency and pressure.
In the following videos, I present ways to maximize T-spin pressure during 9-0, 8-1, 7-2, and 6-3 stacking.
For 7-2 stacking, I present you with ways to sustain LST stacking, the second most efficient T-spin chaining style.
6-3 stacking is among the most frequently used T-spin spamming methods, alongside LST, ST, and LT stacking, which typically happens during 7-2 stacking. The first video will teach you how to improve your T-spin chances during 6-3 stacking. The second boosts your T-spin vision using props.
For 8-1 stacking, I will help you sustain T-spin pressure using Parapet chaining/railing methods.
For 9-0 stacking, there are many methods, such as Hamburger stacking, ST stacking, Yoshihiro, and freestyle T-spin donations.
Sustaining Back-to-Backs (BtBs or B2Bs)
Sustaining Back-to-backs mid-game is difficult, especially when you start to receive garbage lines. Regardless, there are a few simple tricks to vastly improve your ability to do so. Each back-to-back adds +1 attack to your setups, boosting your efficiency.
General Follow-Up Methods
The following video applies to many things in Tetris: it is not enough to make just one T-spin. Instead, one should stack in a way to maximize T-spin continuations and follow-ups.
Canonical Tetris Methods Remastered
The link below covers the most common, canonical Tetris T-spin setups, such as STSDs, STMB Caves, Yoshihiro, DT Cannon, C-spin, Trinity, Imperial Cross, Fractal, and new practical ones.
Because there are so many, I have put them in a separate page here: Link to Canonical Tetris T-Spin Setups

T-Spin Donations and Props
T-spin donations and props are structures that suspend over holes to make a T-spin. Making these vastly improves your T-spin vision mid-game. Please see my T-spin donations and props YouTube videos compilation page on this website, as it is too big to place them all here: Link to T-spin donations page.

Perfect Clears
When you clear the entire field without leaving any filled blocks (i.e., it becomes empty), you make a perfect clear. In most Tetris versions, it sends 10 garbage lines to the opponent.
Performing perfect clears is highly complex, and there is no way that a single video can cover everything. My Galactoid Tetris WordPress secondary website and this howtotetris website cover them more deeply in various articles.
The following is a placeholder demonstration on how to perfect clear. However, it is fairly outdated, comprising clips that were from 2021, when I was a newbie. I will create a more updated one in the future.