I know there are keyboard shortcuts to move to the next and previous frames -- "." and "," but they're not really what I'm referring to. Also, these keys don't necessarily move to the next and previous frames, rather it just seems to move the red playhead instead of the blue highlighted box (which represents the current frame). This is something I'm also confused about with this keyboard shortcut.
I would like to know though, if there is a keyboard shortcut to move to the next keyframe (each frame that begins with a dot). Thanks for your help.
While I am not quite sure what you mean with
"each frame that begins with a dot"
you can use jsfl to program your own macros/shortcuts
In your case start on page 575 of this document
How to get all keyframes of a specific layer: