Here is Minecraft's Simplest Wood Farm - 1.9*-1.21

Most wood farms require a lot of complicated redstone to get decent rates, but this farm accomplishes that while staying incredibly cheap and simple. This farm is also compatible with a dispenser, so you can use that instead of TNT duping if you prefer.

This farm is for Java edition and does not work in Bedrock edition

Thanks to bigbooty17 and Sam for their suggestions on wiring improvements.
TNT Duper by Mercury on bilibili
Moss Farm featured in this video is by Shadowed, Sam, and Redstonia
Join the Technical Minecraft Archive server...   / discord  
...in order to see this farm   / discord  
And thanks to rekrap for showing off this farm in his vids and giving this video a shoutout!



World download: https://www.mediafire.com/file/v96phd...
Litematic for this farm (duper version): https://www.mediafire.com/file/9qnhue...
Litematic for this farm (dispenser version): https://www.mediafire.com/file/7qu7yq...

*just learned this can work as far back as 1.9 with some tweaks, here are all the WDLs for that
*1.9-1.10 World download: https://www.mediafire.com/file/341y4k...
*1.11-1.15 World download: https://www.mediafire.com/file/40tx1g...



Chapters:
0:00 Intro
0:52 Mechanical Explanation
6:08 Materials
6:46 Piston mechanism and Timed Circuit
8:49 Start of TNT Deployment (Duper + Dispenser versions)
9:50 TNT Deployment cont. (Duper version)
12:40 TNT Deployment cont. (Dispenser version)
14:18 Obsidian
15:17 Farm activation and Testing
16:02 How to use
17:42 Outro

Music:
#0 shell (Starting Off) - Dedf1sh - Splatoon 2: Octo Expansion OST (but I added a beat to it, i might link it sometime if ppl are interested in hearing it on its own)
sprinkles - Sam Gellaitry
Julian - Kentucky Route Zero OST
Aria Math - C418