After migrating files from iMac to Macbook Air, how can I also transfer iPhoto and iTunes?

iPhoto has been replaced by the Photos app and

iPhoto is no longer compatible with current macOS.

iTunes has been split into three apps, Music, TV, Podcasts.

Again, iTunes is not compatible and won't work on the

latest macOS.

However, if you used Migration Assistant, libraries from both

apps will have been imported and when first opening any

of the new apps, they will be converted to work with them.

If you used Migration assistant those should have transferred over.