We'll introduce different wave phenomena, parameters that specifically describe periodic waves, and consider "standing waves."
First, and overview of different types of one-dimensional waves.
Next, we'll focus on waves on strings (and ropes, cables, and other similar media), and specifically on periodic waves along strings.
Note the hierarchy of these wave parameters. Since the wave speed is determined by properties of the string (independent of the source), and the frequency is determined by the source (independent of the string), these are said to be independent wave parameters. In contrast, the wavelength of the wave is dependent on both the independent speed and frequency parameters. Algebraically there is nothing wrong with expressing this relation as v = λf and f = v/λ, as long as you recognize that the dependency of λ doesn't change.
Third: "standing waves," which we'll discuss in terms of resonance, rather than the more involved approach of wave superposition and reflections.