Camera bookmarks let you save the current viewing angle and all other viewing attributes. Bookmarks are saved in your scene directly.
Step one - On the viewport menu set, go to view>bookmarks>edit bookmarks... This will open the bookmark editor.
Creating A Bookmark
This only applies to the current camera that's focused in the viewport. click New Bookmark, type the name of the angle in the name attribute and then the description and then hit enter.
Where Are Bookmarks Saved
Each camera has an array attribute for saving bookmarks. To show this, open up the outliner (window>outliner), select the camera, then go to window>hypergraph: connections.