A waveform is the graphic representation of a sound wave usually seen on an oscilascope. A wavelength is the distance between node 1 and 3. A node is a point on a scope where the waveform crosses the zero energy line. An anode is the very peak or valley of the waveform. The zero energy line represents no sound at all.
Pitch is the sound a frequency produces.
See the graphic below to help you understand what all that meant. For the record, all the examples below are based on a sine wave. This is the purest sound that can be produced and thus us the easiest to illustrate. To understand pitch better, the next illustration shows two waveforms. Octaves are all a subset of the same frequency.