Simply choose the Header Height to fit your desired preferences. This is handy to use for situations with your menu and logo design.
Enabling the Sticky Header will cause your header to stay on top when scrolling down pages instead of scrolling out of view with pages.
If you would like to use a standard image instead of an .ico file this gives you the option to choose a 16px x 16px .png or .gif image that will be your favicon. The favicon is the icon that shows in a browser tab/page title and bookmarks.
If there is an .ico file that is desired to use instead simply place that in the template/root/ and leave this empty.