- One with "index" in the URL (e.g. https://learn.hubspot.com/totara/dashboard/index.php?id=25)
- One with "layout" in the URL (e.g.https://learn.hubspot.com/totara/dashboard/layout.php?id=25)
The first type of URL with "index" is what all HubSpotters will get to when they access the dashboard from the main navigation menu.
The second type of URL with "layout" is what the dashboard editors will get to when they access the dashboard from the "Manage Dashboard" settings. The "Manage Dashboard" settings is where someone creates/edits a dashboard. HubSpotters with no dashboard editing permissions would not be able to view/access this link.
If you have dashboard editing permissions, you will see a "Customize this page" button on the "index" URL. Clicking this button allows you to customize your own view of this dashboard. So when you're editing a dashboard, you want to make sure that you're editing from the "layout" URL and not the "index" URL, so that the changes are reflected for all HubSpotters.