Creating Roll-Up Summary fields

Select Setup and select Object Manager.
Select the Academic Profile object from the list.
Under Custom Fields & Relationships, select New.
Enter a Label and Name for the field.
For the Data Type, select Roll-Up Summary.
Select Next.
Enter a Field Label, Field Name, and Description.
Select Next.
For the Summarized Object, select Courses.
For Roll-Up Type, select Count.
Under Filter Criteria, select ‘Only records meeting certain criteria should be included in the calculation.’
Enter your Filter Criteria.
Select Next.
Configure the Field-Level Security that should apply to the field.
Select Next.
Indicate the Page Layout(s) that should include the field.
Select Save.

Create a Roll-Up Summary field on the Academic Profile object.
Select Setup and search for Fields.
Under Contact Custom Fields & Relationships, select New.
For the Data Type, select Roll-Up Summary.
Select Next.
Enter a Field Label, Field Name, and Description.
Select Next.
For the Summarized Object, select Academic Profile.
For Roll-Up Type, select Sum.
For Field to Aggregate, select the roll-up field you previously created.
Under Filter Criteria, select ‘All records should be included in the calculation’.
Select Next.
Configure the Field-Level Security that should apply to the field.
Indicate the Page Layout(s) that should include the field.
Select Save.