Redstoners when people tell them to sort it out...

WTH Playlist    • What The Heck?? - Redstone Guides  

Links to awesome designs:
Overflow-proof sorter by @impulseSV -    • Minecraft - Tutorial: Quick & Easy It...  
Shulker box filter by @metamilo -    • Component Showcase: Shulker Box Filter  
Multi-item sorter by @gnembon -    • Minecraft: Silent, Lag-effective Mult...  
Multi-item sorter by @TangoTekLP -    • Minecraft Tutorial: Automated Silent ...  
"ReCategorizer" by @MaizumaGames -    • ReCategorizer: NEW Sorter Explained |...  
Multi-item sorter by @RaPsCaLLioN1138 -    • Multi-Item Sorter V5 [Moony MIS]  
Armor sorter by @ilmango -    • 1.15 Armor Sorter  
Individual armor sorter by @RaysWorks -    • Pieces of Armor Sorter [infinitely au...  
Potion sorter by @ilmango -    • Minecraft Potion Sorter  
Individual potion sorter by @Ashlaja -    • Proof of Concept:  Sort Individual Po...  

Chapters:
00:00 Intro
00:18 Black Box Demo
01:57 What's Inside?
02:43 How It Works
09:20 Overflow Protection
12:37 Non-stackable Filter
14:07 Shulker Box Filter
14:56 Full Chest Sorter
16:21 Other Cool Designs
17:29 Outro