Hello @MS here is a comprehensive guide on HubSpot’s User Roles & Permissions - I’d reccommend bookmarking this for future reference
For reference here is a brief breakdown:
Please note: Users with a View permissions setting of Owned Only will only be presented with contact records for which they are assigned as the HubSpot Owner within the Contacts dashboard, All Contacts, and Lists in the Sales and Marketing product; however, they can still view a contact that is not owned by them if they are sent a direct link to the contact.