Watch as Stephen and Gunnar cover some of the capabilities of custom blocks, as well as an end-to-end tutorial of building a custom block with behaviors and visuals.
You can find the examples used in this sample at https://github.com/microsoft/minecraft-samples/tree/main/creator_camp.
Create a Custom Block: https://learn.microsoft.com/minecraft/creator/documents/addcustomdieblock
Blockbench Block Wizard: https://learn.microsoft.com/minecraft/creator/documents/minecraftblockwizard