You always need (1) strip lights and a (2) power supply to make a single-color strip light system.
In addition to these two components, for a multicolor system you will also need a (3) controller and a (4) remote.
Optional components are available based on the needs of your project.
(5) Aluminum Channel (also known as Extrusion or Profile) is useful if you need to protect or mount your strip lights. You may also like to use them for visual appeal.
(6) Diffusers (plastic covers) are used to protect your strip lights and to improve their aesthetics.
(7) Connectors are used to make your connections easier without soldering.