Hi I Have these equations and I don't know and understand what each of them means. Can someone help me?

$$v=v_0+at$$ $$x=v_0t+\frac{at^{2}}{2}$$ $$v^{2}=v_0^{2}+2ax$$ What does each of them do at certain distance,acceleration and velocity? At class the teacher didn't explain us how each of these formulas work.