How to make recommendation system like YouTube, FB etc

Question

Guys I am making an android app, In which Dealers Upload products and Users See Dealers Products. Can anyone tell me how should I make a recommendation system for my android app that can automatically recommend Products to the user? Like Users Can see their Favorite products on Home Screen and If someone purchase Mobile phone than it recommend Earphones and Phone accessories to Users. In android studio.

Answer 1

they collect, trade, ask, buy user's data across platform and services.
along with specific algorithm, data analysis and mining they predict which is the product you will like

Answer 2

🎃#H P 22™🎃 How?

Answer 3

🎃#H P 22™🎃 Thanks man