When you receive Credentials you have the option to mark the person or organisation who gave you the Credential as a "Trusted Issuer". You'll see the option upon initially accepting or later managing any accepted Credentials. Credentials received from Trusted Issuers is automatically accepted. For example, if you receive Credential from a museum you visit or a school you attend, you can set the museum or school to be "Trusted Issuers". That way, when you receive new Credentials from them, you will not need to click the "Accept" button each time.
In addition, when accepting or managing credentials, you have the option to place each credential into one or more personal categories you create. When you Trust an Issuer, you can also set the categories into which credential from that issuer should be sorted. This makes it easy for your credentials from the museum or school to get automatically placed in your "Museum" or "Education" categories, for example. (You can later change or add categories, even for automatically accepted and sorted credentials.)
You can remove the Trusted setting from any Issuer you have previously trusted by clicking "Trusted Issuer" next to their name and then clicking the "Remove Trust" button.