we have the function

Find out the first derivative

Equate the first derivative to zero to calculate the critical points

The critical point is at x=0
Evaluate the first derivative at the intervals
(-infinite, 0) ----------> f'(x) is positive -------> f(x) is increasing
(0, infinite) -------> f'(x) is negative --------> f(x) is decreasing
that means
x=0 is a maximum
Find out the y-coordinate of the maximum
For x=0

The maximum is the point (0,1)