Set WordPress to use pretty permalinks
Out of the box, WordPress will use Plain permalinks. That means any post or page will be displaying their respective IDs.
Example:
To change the default permalink structure, follow these steps:
Go to WordPress Dashboard → Settings → Permalinks
Select Post Name
Click Save
Change the URL(permalink) of a page/post
Go to WordPress Dashboard → Pages → All Pages.
To change the permalink of a page, select the Edit option for that particular page.
Using the Right Sidebar, click on the URL option:
Change the Permalink value to the new value
Click on the Update button.
Pro Tip: The same process can be used for Posts/Products/Projects.
Bonus: Using the WordPress Quick Edit functionality to quickly change the Post/Page permalink
Go to Dashboard → Pages → All Pages.
Hover on the page for which you want to change the Permalinks
Click on the Quick Edit option.
Change the Slug and click on the Update button.
Note: Post/Page slugs cannot contain spaces. If a space is being used in the Slug, WordPress will automatically convert that to a dash (-).