When you add a new page to your website, its URL mimics the page title. If you rename the page, the URL is also automatically updated.
Non-Latin symbols are replaced with Latin symbols.
If the alphabet is not recognized, a random ID is generated for the URL. You can easily fix it manually:
From the toolbar on the left, open the Pages and navigation panel,
Open the Page settings of a particular page,
Insert a correct URL and save the changes.
If you have an online store, your product URLs are generated automatically. They depend on your product name and include a product ID by default. The IDs are not editable, but you may edit the product name, and the URL will change automatically.