What is primary structure

it is the sequence of amino acids in the protein it is really simple!

When referring to a protein, primary structure is the actual sequence of amino acids in the protein. This tells you the most basic components of the protein, without telling you protein secondary structure. Secondary structure is how the amino acids within the protein fold into canonical shapes: the alpha helix, beta pleated sheet, etc. Tertiary structure is the overall arrangement of secondary structures, and is basically the whole protein. Quaternary structure is multiple proteins fitting together in a complex.

What are you referring to? Architecture? Biology?

I assume biology...
The primary structure of a protein is its linear sequence of amino acids and the location of any disulfide (-S-S-) bridges.