The tidal force is generated by the combination of gravitational attraction between the earth, moon and the sun and the rotation of Earth-sun and the earth-moon system. The tides rise and fall on the ocean surfaces. The moon has a large effect on the generation of the tides than the Sun.
The moon phases are primarily caused due to the different angle of orientation when visualized from the planet earth. The prime reason for changing faces of the moon is its position relative to the position of sun and earth. When the moon is passing in front of the earth, all its bright phases occur in that phase of the lunar cycle as moon gets light from sun which makes it visible on earth. While when moon is in a position where earth lies in between the moon and sun, the moon goes through its dark phases as the light of sun is restricted by the planet earth.
