Hi,

1. Code-First: Good if you already have a clear model, and the project start from scratch
2. Model-First: if you design entities when we work together with other team, IE: User, designer, developer, and other stake holder, like using modelling on Visual Studio, it's non technical works
3. Database-First: we do not have an choice when we create a project using existing database.
4. General: It's good to know them all, in some cases one of them is better, in other case is not.

Unfortunately I am not a good person to describe things.

c u