What are the differences between a Model and a Resource model? Also what is a model and a resource model?
Models : Models are where your main business logic should be handled and is a single instance of an object. The model will use the resource model to talk to the database and get/set data for it on
Resource Model : A resource model is where your main C.R.U.D happens (Create, Read, Update and delete). The resource model shouldn’t contain business logic however it will talk to the adapters and basically talk to the database.
Models are where your main business logic should be handled and we can get or set one row of entity by using Model. Model will call the resource model to get or set entity in database.
CRUD operations are handled in resource model but it don't have a business logic.
Collection have lot of attributes and filters. It has a whole entity of data. Using filter method, we can filter specified data from database table.