You want to modify the content of a page you've created. Even after you've posted content on a page in your store, you can always go back and change it. If you spot a typo or want to add new information, it's easy to edit your page.
You might want to create a new menu to give your visitors easy access to pages or collections in your store. Some themes allow you to use menus for store content. menus are often used by a sidebar, or a Shop by category section on your storefront.
From your Shopify Home, you can access the different sections of the Shopify admin using the left navigation:
Caution! The Theme of a Shopify store controls all aspects of the store's appearance and layout. You manage your themes from the Themes page of your Admin. Theme edits are generally for advanced users only as it often invoves use of code. Small errors may result in loss of website, functionality, etc. Please contact site developer before making changes to theme / code.
You can insert or embed videos in blog posts, pages, product descriptions, and collection descriptions using the rich text editor.