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I'm having a Little bit of trouble in Cubic Functions, especially when i need to graph the Turning Point, Y-intercepts, X-intercepts etc. My class teacher had told us to use Gradient Method:

lets say: $$f(x)=x^3+x^2+x+2$$

We can turn this equation around by using the Gradient Method:

$$f'(x)=3x^2+2x+1$$

so it a quadratic equation. But i would like to find out more about this method too, if anyone knows. Basically i am not good at sketching graphs so if anyone has a website that might help me find out more about cubic functions and how to graph them, or if anyone can help me out, i'll be thankful.

Thanks.

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