What is the header menu
The header menu is the main navigation bar usually at the top every page of your store.
See an example below
How to make a menu
The menu is made up of 2 parts a Menu widget and the Menu manager links
Part 1 - Menu manager
Found in Appearance => Menu Manager
Create your links by adding them to your "Header menu"
Part 2 - Menu widget
Found in Appearance => Layouts => Header
Associate your "Header menu" to the widget that's in your header layout
Menu Manager
The menu manager allows you to create lots of different menus that can be used in areas all over your website e.g. in your footer, sidebar, or content pages. It also controls your main navigation links for your main menu bar.
Setup
Navigate to Appearance => Menu Manager
Open the "Header menu"
Add your links using the "Link Type" dropdown
Drag-n-drop your links into position
Important: The dropdown menus only support up to 3-4 levels deep. This is to provide a better user experience for your users and to insure it work in all screen resolutions.
Best practice:
Add only a few links at a time, then save your menu and check how things appear on the storefront.
Remember not to add too many links as they won't be shown on the storefront and may cause your menu to break for your users.
Menu widget
The menu widget is designed to give you control over the position of your menu on the page. You can drag-n-drop it into different positions based on your design. You might want it below your logo, or above your logo, or even further down the page.
Setup
Navigate to Appearance => Layouts => Header
Open the widget settings
Scheme Layout dropdown and choose either the vertical or horizontal
If you use the Vertical layout, you will get a choice for additional links that will appear to the right of the "Shop by" dropdown flyout.
Important: The "Additional links" should be pulled from another custom menu. Simply create another menu in the menu manager. Then return to the menu widget and select it from the "Additional links" dropdown.
Navigate to the menu widget
Widget selections/settings
Each widget has its own selections when you click inside it. These will allow you to make changes to the look
Types of Menus
Vertical Menu
Horizontal Menu