How to change the web application primary administrator

Correct me if I understand wrong https://kb.intermedia.net/Article/2158 https://www.c-sharpcorner.com/UploadFile/93cb27/change-site-collection-administrators-in-sharepoint-2013/ https://docs.microsoft.com/en-us/sharepoint/sites/change-site-collection-administrators https://docs.microsoft.com/en-us/sharepoint/administration/manage-the-app-catalog