Longitude waves oscillate parallel to the direction of energy transfer of the waves. Sound waves in are a longitude waves

Mechanical waves need a medium to travel through. They can be transverse or longitude waves.

Transverse waves oscillate perpendicular to the direction of energy transfer of the waves, ripples on the surface of water are transverse waves. So are all electromagnetic waves

For any wave, its wavelength is the distance from a point on the wave to the equivalent point on the next wave e.g. from one wave through to the next

For any wave, its frequency is the number of waves passing a point per second.

For any waves, its amplitude is the maximum displacement of a point on the wave from its undistributed position, such as the height of the wave crest (or the depth of the wave trough) from the position at rest