The summary map of the altimeters shows the main GPM, ie the highest points.
Clicking on the icon will open a window with the characteristics of the climbs that lead to the point in question. You can find: side (location from which the ascent starts), length, elevation gain, average slope, maximum slope, detailed altimetry link and the link to the corresponding post.
The climbs have not been categorized by difficulty, as there are many variables that can affect it in addition to the length and slope, such as the road surface or climatic conditions. I wanted instead to list the main parameters with which the rider can understand the type of climb he will deal with. Before tackling the climb, however, I advise you to look at the detailed altimetry and to read the corresponding post, in which surely there are useful information that can not be summarized with simple numbers.