Sync photo albmus between Mac and iPhone
There are two basic ways to do this. You can use iCloud for storing pictures and then also use it for pictures on your Mac.

The other way is when you connect your phone to your Mac with a lightning cable. Then you can go in iTunes and go to the phone setting and sync options where it will ask you what do you want to sync there would be multiple tabes pictures would be one of them. (YOU WILL HAVE TO TURN OFF ICOULD FOR THIS)

if you are on macOS Catalina then you can connect your phone go to finder. go to your phone, and change tabs to pictures and check the sync option. Then go back to the general tab and then click sync, it will take some time but you should be able to do it. 

This Video from apple should help you