This is a web part page. This text is inside of a content editor web part.
A test ASPX page = >
If you want to update the ASPX page, you must use SharePoint Designer or some other tool. There are no webparts on that page. All content is inside of starting and ending <form> tags.
Test image, inside a Site Assets library =
Test image, inside an Images library = https://www.sheriff.org/S2020v1/Img/hero1.jpg