The Nature of Light

[Sigurd]

Are you referring to Wave–Particle Duality, Special Relativity, Quantum, Quantum Electrodynamics, or String Theory?

I guess all the above.

Do you remember what you were taught first? Was it only about light being particles?
Then later in a more advanced class you learned that light also had wave attributes. From there it snowballed...
Mind you I never took any science classes at university. The last physics class I had was in secondary school.