in the registry handler class send the block item registry to follow your block class and it will use the texture in the blocks section in resources
what he means is that, in code, to create the inventory texture, you create a new ItemBlock and a new Block. ItemBlock takes a block as a parameter, like so:
new ItemBlock(<any variable with the Block data type>)
This creates the block you see in the inventory, and will grab the texture from whatever Block variable you entered into the ItemBlock parameter.
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