What is the meaning of Proto?

Prototypical; preceding the proper beginning of something.

A prototype of a design.

A protogen.

therefore, hence, that is why

prototype

chief of a workforce

an architect in charge of maintenance and restoration of St Mark's Basilica

the chief worker in a print shop, in charge of composition and layout

typographer, typographist

know-it-all

Source: wiktionary.org