Im working on my study guide..and I have no idea how to do these types of problems.Can anyone please just give me a hint on how I can approach these?

I attached the graph.

a few of the questions im having trouble with are:

At which point is f'(x)> 0?

a) A b) B c) C d) D e) None of these

At which point is f'(x) =0 ?

a) A b) B c) C d) D e) None of these

At point F, is:

a) concave up b) concave down c) neither, F is an inflection point d) None of these

Im not sure how to even begin on these. Derivatives confuse me.Any feedback would be appreciated!