Why do I need to take care of the packaging licensing in Germany (myself)?

How do I take care of the packaging licensing (myself)?

What in the name of the holy goat is an HS Code?

What is the difference between EAN Codes or FNSKUs for my products?

Do I need EANs or FNSKUs for distribution via SPACEGOATS?

Where do I need to register my brand?

Do I need a customs tariff number (TARIC or HS code) for products manufactured in Germany?