Sorry if these are dumb questions, but I'm going to ask them anyhow.
If I have a hen and a rooster, does that automatically mean the eggs are fertilized?
And does my RIR hen know she's supposed to sit on the eggs and hatch them? Because she's not. Will she hatch her own eggs or do I have to hatch them myself?

If I have a hen and a rooster, does that automatically mean the eggs are fertilized?
And does my RIR hen know she's supposed to sit on the eggs and hatch them? Because she's not. Will she hatch her own eggs or do I have to hatch them myself?