I recently worked on the zero conditional again:
"When water reaches 100 degrees, it boils".
It´s a general truth. Funnily, I was very much intrigued when I listened to a favorite song of mine: "Learn to fly" by the Foo Fighters.
The chorus goes as follow:
"I'm looking for a complication
Looking 'cause I'm tired of trying
Make my way back home
When I learn to fly (high)"
"When I learn to fly (high), I make my way back home" or vice versa.
It should be the zero conditional, but it states something more like a plan or hope rather than a general truth, doesn´t it?