You can create albums to better organize your photo library.
Create an album
Do one of the following:
Create an empty album: Choose File > New Album, or click the Add button next to My Albums in the sidebar, then choose Album.
Create a new album from a group of photos: Select the photos you want in a new album and choose File > New Album With Selection.
Type a name for your new album in the sidebar and press Return.
Tip: You can also select the photos you want in a new album, Control-click a selected photo, choose “Add to,” then choose New Album.
Add photos to an existing album
To add photos to an album, do one of the following:
Select the photos you want, then drag them to an album in the sidebar.
Select the photos you want, Control-click a selected photo, choose Add to, then choose the album.
Select the photos you want, then drag the thumbnail in the selection indicator at the top of the window to an album in the sidebar.
Add photos to an existing album from a folder in the Finder
Drag a folder of photos from the Finder to an album in the sidebar. Photos adds the contents of the folder to the album.
If you selected the “Copy items to the Photos library” option in Photos preferences, the photos are added to your Photos library. To save disk space, you can delete the photos from the folder in the Finder.
Remove or rearrange photos in an album
Double-click the album to open it, then do any of the following:
Order photos by date: Choose View > Sort, then choose Keep Sorted By Oldest First or Keep Sorted By Newest First.
Rearrange photos manually: Drag the photos into the order you want.
Order photos alphabetically by title: Choose View > Sort, then choose Keep Sorted By Title.
Remove photos from an album: Select the photos, then press Delete, or choose Image > Remove [number] Photos from Album.
The photos are removed only from this album, not from other albums in your photo library. If you accidentally remove a photo from an album, choose Edit > Undo to restore it.
Note: You can’t delete photos from a Smart Album or from the albums created for you, such as Videos or Bursts. The photos are added to these albums automatically based on the search criteria of the album. You can delete selected photos from your entire library and iCloud Photo Library by pressing Command-Delete.
Remove or rearrange albums
Click My Albums in the sidebar, then do any of the following:
Merge photos in one album with another album: Drag an album into another album.
Merge two albums into a folder: Option-drag an album into another album.
Order albums by date: Choose View > Sort, then choose By Oldest First or By Newest First.
Rearrange albums manually: Drag the albums into the order you want.
Order albums alphabetically by title: View > Sort, then choose By Name.
Remove an album: Control-click the album, then choose Delete Album, then click Delete.
The album is removed from the library and your iCloud Photo Library; the items in the album are not removed and remain in your photo library. If you accidentally remove an album, choose Edit > Undo Delete Album to restore it.
Tip: You can also sort projects by name or date created and sort items in the sidebar. You can’t sort items in a moment.
Select a key photo for an album
You can choose an album’s key photo—the photo that represents the album in the Photos window.
Double-click an album to open it, then select the photo you want as the key photo.
Choose Image > Make Key Photo.