Rails Model, View, Controller, and Helper: what goes where?

Question

In Ruby on Rails Development (or MVC in general), what quick rule should I follow as to where to put logic.

Please answer in the affirmative - With Do put this h

Answer 1

In simple terms, generally, Models will have all the codes related to table(s), their simple or complex relationships (think them as sql queries involving multiple tables), manipulation of the data/variables to arrive at a result using the business logic.

Controllers will have code/pointers towards the relevant models for the job requested.

Views will accept the user input/interaction and display the resultant response.

Any major deviation from these will put unwanted strain on that part and the overall application performance may get impacted.