After Putting a Photo Into an Album, How Can I Tell in The Main Photo's Area That Its Already in An Album?

You can create a smart album with the single rule:

Album is not Any

To create the smart album use "File > New Smart Album"

This smart album will only contain photos that are not in any standard album.

Add photos from this smart album to other a albums, not from the main "Photos" view.

Simply make one smart album, as Leonie describes above.

This will find all the photos not included in any album.

Then as you add these to an album, it will be dropped by the Smart Album

So, you have a running list of images that are not in an Album, as per your question:

how do I know if that photo is in an album already from the main photos area so I don't add it again?

Im so sorry but im so confused. So I should delete all my albums I created and create all brand new smart albums and create a "rule" for each new smart Album?

Keep your albums.

Smart albums will populate automatically, according to the rules. They just help you to search for photos that have some properties, like keywords, cameras, dates.

If you set the rule to "Album is not any" you will see all photos in this smart album that have not yet been assigned to any album. If you now drag a photo of your dog from this "Album is not any" smart album to your album with the pictures of your dog, it will vanish from the "Album is not any" album, because it is now in an album.

Added: I see, TD already explained this. 🙂

You're welcome 🙂 Good Luck!