A simple neutral amine has nitrogen bonded to one, two, or three groups attached through carbon, with hydrogen filling the remaining positions in the neutral three-bond form. These are the primary, secondary, and tertiary forms respectively. An amide has different connectivity to a carbonyl group. [ref]
https://openstax.org/books/organic-chemistry/pages/24-1-naming-amines. McMurry: classification of amines
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