How can I add “blind” links to my navigation

If you want to add a “blind” link or an anchor (for example as anchor for your sub-menu) to your menu, just go to WordPress admin area -> Appearance -> Menus, open the box for “Links” to the left, insert “#” as URL and the title of your choice, then click the “Add to Menu” button, move the new menu entry with to the place you want and save the menu.