The core law itself: Φ = N·B·A·cosθ, and what happens when you change B, A, θ, or the shape enclosing the area, one factor at a time.
Two coils, one field, or one coil talking to itself: mutual induction, self-induction, and multi-turn effects.
Induction does not just create a current, it creates a force that fights back. Dissipation, charge pile-up, and motion settling into balance.
Faraday's law does not need a magnet or a textbook loop. Induction driven by a current-carrying wire, and by a single moving charge.