Wasn't Iran supposed to be a dangerous country. They've not managed to do any real damage it seems to Israel or any American ships?

Damage to material things aren't as important as hurting people. Iran supported terror across the region especially through proxies who have been responsible for killing many thousands of people. They have been on a path towards a nuclear weapon which could have killed hundreds of thousands. Some say they would never use one if they had one, but their history does not prove that to be true.

Their last gasp is to limit access through the Straight of Hormuz. That has energy markets spooked and is raising oil prices which are now trading in the mid $90's. As a reference, oil peaked at $123/barrel 4 years ago. It was at $65 three weeks ago.