Answer
Sometimes
Work Step by Step
A $\textbf{turning point}$ of a function is a point in which the $y$-coordinate is a local maximum/minimum of the function which means the point is higher/lower than all nearby points.
Consider the cubic function:
$$f(x)=x^3.$$
This function does not have a turning point.
Consider the cubic function:
$$f(x)=x^3-x.$$
This function has two turning points.
Therefore the answer is SOMETIMES.
