Can you help me get my iphotos back on my mac book air

iPhoto does no longer run on Catalina.

But you can open the iPhoto Library in the Photos.app instead.

The first time you launch Photos, the Photos.app will open your last used iPhoto Library and create a Photos Library from it and you should be seeing all your photos.

If Photos does not open your main iPhoto Library, quit Photos, if it is running.

Then hold down the options key ⌥ while launching Photos again. Release the key when the library chooser dialog appears. Then select the library you want to open.

See this user guide on how to use Photos: Welcome to Photos - Apple Support

Launch the new Photos app with the Option key held down and in the Choose Library window select your iPhoto Library and open it. It will be migrated to a new Photos library.

This is the Photo app: