I've seen posts asking about Tinkers Construct 1.16 Traits and Modifiers. Since the guidebook is not yet ready, here is one of the design docs for people to look at for now :
Netherite (Modifier) | Tinkers' Construct 3 Wiki | Fandom
Tinkers' Construct Wiki | Fandom
Tinkers' Construct Mod (1.18.2, 1.16.5) - Modify All the Things - 9Minecraft.Net
Tinkers' Construct Addon (1.19) - MCPE/Bedrock Edition Mod - 9Minecraft.Net
Minecraft Mod Review - Tinkers' Construct - Tools & Weapons - Part 3 - YouTube