The first video (above) is Khan Academy's explanation for finding the volume of both cuboids and triangular prisms.
The above video contains an explanation on finding the volume of cubes and cuboids.
A cuboid is the same thing as a rectangular prism.
"Cubic centimetres" means the same thing as "centimetres cubed".
Study and practice
Use these search terms to find additional resources:
calculate volume of cube
calculate volume of rectangular prism
calculate volume of triangular prism