In this video I cover what apps you need for your Shopify store. Two apps that you must install and the rest depend on your store and what you are selling.
Different stores require different apps
Try out apps and see if they are right for your store. This takes time. I suggest only one app at at a time.
2 Apps that are a must for social proof and scarcity :
Fomo – https://www.usefomo.com/
If you are printing on demand:
Printful – https://www.theprintful.com
Teelaunch – https://teelaunch.com/
Printify – https://www.printifyapp.com/
(have not tried this before)
If you are drop shipping:
Oberlo – https://www.oberlo.com/
Expressfy – http://expressfy.com/
Importify – https://www.importify.net/
(Expressfy and Importify are same developer)