Basic textbooks or introductory materials for teaching fundamental subjects; also, substances applied as preparation for painting or coating.
From Latin primarius meaning 'first' or 'primary'. Originally referred to a prayer book, then evolved to mean any elementary textbook in the 15th century.
Primers serve as the foundation layer in both education and painting - they prepare the surface for what comes next! The word connects the idea that all complex knowledge needs a solid base coat.
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