This page highlights the difference between a solar and lunar day, explaining high and low tides and how they are related to the lunar day.
https://oceanservice.noaa.gov/education/tutorial_tides/tides05_lunarday.html
Discusses Types and Causes of Tidal Cycles - Diurnal, Semidiurnal, Mixed Semidiurnal; Continental Interference
https://oceanservice.noaa.gov/education/tutorial_tides/tides07_cycles.html
Explores characteristics of tides including description, classification and shape.
https://oceanservice.noaa.gov/education/tutorial_tides/tides08_othereffects.html