Entity Framework automatically not mapped properties in code first

Using entity framework code-first, I have a property.

bool isItTrue {get;set;} // this will get mapped (create a column in the DB)

[NotMapped] 2. bool isItTrue {get;set;} // this will NOT get mapped

bool isItTrue {get {return someIntProperty < 3;}} // this will not get mapped porque why?

Now, I realize that it's a calculated field.

So my question is whether there is a set of rules on what will and will not be mapped to the DB.

For example, A property will be mapped unless 1) annotated with notmapped OR 2) Fluent API ignored ---- modelBuilder.Entity() .Ignore(p => p.isItTrue); 3) calculated field? No set method? 4) others?

If question can be improved, please lmk.

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