How 3 Phase Transformers Work – why we need them

How do 3 phase transformers work, why are three phase transformers used, how do they produce 480V, 277V, 240V, 208V and 120V. What is wye delta, open delta and high leg delta. What is a pad mounted and pole mounted transformer and how is three phase electricity generated?
Edit 8:36. Nameplate shows Delta-Wye not Wye-Wye as text shows

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[0:00] Three-Phase Transformer Explained
[0:14] What a Transformer Does
[0:30] Three-Phase vs Single-Phase Transformers
[1:05] How Split-Phase 120V/240V Works
[2:33] Where Three-Phase Power Comes From
[3:19] Why Three-Phase Power Is Better Than Single Phase
[3:54] Why Power Is Transmitted at High Voltage
[4:47] Why Homes Get One Phase and Commercial Buildings Get Three
[5:00] Transformer Sizes and KVA Ratings
[5:29] How a Transformer Works
[6:33] Why Transformer Cores Are Laminated
[7:04] Step-Down vs Step-Up Transformers
[7:40] How Transformer Power Stays the Same
[8:09] Delta vs Wye Transformer Connections
[8:34] How to Read a Transformer Nameplate
[8:39] Wye Connection Explained
[9:16] Delta Connection Explained
[10:03] Delta Primary to Wye Secondary Transformer Example
[10:46] How to Calculate Transformer Current and KVA
[11:28] Wye-Wye Transformer Example for Commercial Buildings
[12:34] 480V to 208Y/120V Transformer Explained
[13:13] Transformer Taps Explained
[14:39] How Transformer Tap Changers Work
[15:08] Pole-Mounted Transformer Bank Configurations
[15:28] Delta-Delta, Delta-Wye and Open Delta Explained
[16:06] Wye Voltage and Current Formulas
[16:52] Why 208V Comes From a 120V Wye System
[17:42] Square Root of 3 Explained
[18:36] Delta Current Formula Explained
[19:46] Why Delta Line Current Is Higher Than Coil Current
[20:55] Delta-Wye Transformer Calculation Example
[21:47] High Leg Delta Explained
[22:43] Open Delta Transformer Explained
[23:01] Why Open Delta Has Lower Capacity