Photos on High sierra

Photos keeps crashing , some times when i go in the menu on the left is missing or only has basis files , when clicked on nothing there , after shutting down and re starting a few times it comes back , when i transfer pics from my iPhone x it shuts down half way through , when i resume it it duplicates all the pics again . if i have my phone connected to my MacBook air and open photos it never gives all the files down the left hand side . i have no confidence in photos any more , is there a more reliable program/app i can use , I'm frightened I'm going to lose

all my pics one day !!