The Excel Add-in includes tools to let you pull 13F/13D/13G data from the WhaleWisdom API directly into Excel without needing to understand the technical details of the API.
The Add-in currently lets you select a group of filers or group of stocks and will pull the latest 13F data for them, optionally augmented with any Schedule 13D/G filings that have been released after the 13F filing date.
The instruction manual is available at https://whalewisdom.com/excel/Whalewisdom Excel Add-in.pdf for anyone to download and look at to give you an idea of the features available.