You can set the value of “Radius” to resize a “Collider” and etc.
“Rendering” refers to converting 3D data on a computer to a 2D image and displaying it on a screen.
“Rigidbody” is a term that stands for a “rigid body”. It refers to an object that does not deform against force from the outside (inside).
In Unity, the Rigidbody component allows you to set presence or absence of gravity, object mass, and so on based on physics.