I'd like to update the products in my shop from various users who should only see the absolutely needed input fields so that no-one gets confused.

The entries 'Webdesign' and 'Geschenkoptionen' should be hidden for users with usergroup 'Produktpflege' (Anm.: German for 'Product Maintenance').
After doing some reasearch it seem preferably to create an own extension.
I guess I found the right english Post already: Hide Attributes and Other Fields in Product Edit Backend Unfortunately I am new to this, this is why the Post does not explain enough for me. Right now I am not sure which extension should be extended and I don't know how I can assign it to certain users.
Could someone please give me a hint for my XML-files?
Big thanks in advance.