Is there a tutorial showing how to make a circle in toolbox?If there is, please tell me, it would really help.

You can't make a proper circle in TB, but a multi-sided part(s) will do.

You can use the Shape Part to make a basic octagon,

OR: make a set of shapeboxes placed together to make a square box, and then shape the edges to "round" the box to make your circle.

i don't use shapes, i tried to make a wheel & it turned out all lopsided & ugly.