Learn the basics of open sights, scopes and red dots can come later.
That used to be my view, but I now think the opposite. The truth is that there is no need to ever learn iron sights... they're optional.
It's like learning to drive a car. 60 years ago, almost everyone started by learning a stick shift, because all cheap cars that were likely to be their first car were manuals. Now very few new drivers ever learn to drive stick at all, much less as a first step. I think it's easier to add the older, more difficult method back after learning the basics.
To be clear, I love stick shifts and I love iron sights. But I no longer think either of those are the best ways to learn the basics.