You can't get your "actual" credit score for free. The free ones aren't what lenders use.
Correct, although the free ones are basically correlated. The range is different, you just have to know that for example 750 on one score is about the same as a 700 somewhere else.
Unlike Lord of the Rings, there is no one "true score". Each bureau has its own algorithm and some lenders have their own custom scores as well.