I can’t differentiate the colors of the lines and areas. It’s confusing.

Switch between the different Map Views (Map, Satellite, Hybrid or Terrain) to have a better contrasting background (click white boxes on the upper right corner of the map to switch).

In the Legend on the right, you can hover over any of the color blocks in the Lines & Areas section for a definition of each color. Also, if you click on a line or area, an info-window will be displayed with detailed information about that specific line or area.