The document discusses three main types of coastal erosion: corrasion, where waves hurl rocks against the coast cutting and breaking rocks; attrition, where materials carried by waves knock against each other resulting in smaller, smoother pieces; and solution, where soluble minerals in rocks are dissolved and removed by seawater like limestone reacting with carbonic acid. It also briefly mentions hydraulic action where the weight of waves smash against the coast weakening rocks and water surging into cracks widening them further.