No need to know oxidizing agents, reducing agents, or the Nernst equation so disregard mention of them in any of these links.
What are Standard Reduction Potentials? (video)
Calculate Cell Potential (video)
Delta G and Electrochem (video)
Electrolysis and How it Differs from Voltaic Cells (video)
Galvanic (voltaic) cells and Electrolysis with particle pix
Written Summary of Unit
Two Practice Tests for Electrochem