Easy navigation and a reponsive template are IMPORTANT to every website. Keeping it simple encourages the visitor to stay longer and view more.
Keep your website simple and easy for the visitor to find what they are looking for.
When the visitor is comfortable they are interested, they will stay, they will become a customer.
WordPress Roles
WordPress makes it easy for others to use, monitor, edit, maintain your website without blowing it up (only an Admin can do that). https://www.wpbeginner.com/beginners-guide/wordpress-user-roles-and-permissions/
User, Contributor, Author, Editor, Administrator
View a simple list of which role can do what on WordPress. https://www.wpbeginner.com/beginners-guide/wordpress-user-roles-and-permissions/?display=wide