I would like to change a font color when I select a page from the main menu.
Can you please let me know how to do that.
Example if user is on a home page I would like “home” to be blue and rest of the menu font color black indicating the selected page. Also I have anchors in my menu, so for example I have menu item Home and features. Features is on a home page, connected to a menu via anchor. When I select features I would like the font to be blue on features since I selected it.

Thank you.

So for the first level of navigation you can easily achieve by adding this in your Custom Styles (in Theme Options):

#menu li.current-menu-item > a {
color: green;
}