1- The content CatPhotoApp must be inside the tag <h1>HERE</h1>
2- You have an error in the content of the comment I advise you to copy and paste
To avoid mistakes
Commenting allows you to leave messages without affecting the browser display. It also allows you to make code inactive. A comment in HTML starts with <!--, contains any number of lines of text, and ends with -->. For example, the comment <!-- TODO: Remove h1 --> contains the text TODO: Remove h1.