Well, there is a teacher on youtube who says I can use modals in both Zero and 1° conditionals . That's good, but She says this in 1° conditional:
You can increase your luck if you carry a rabbit's foot
and I ask... why this question is not a zero conditional? because the video of the zero conditional, she wrote:
If you watch my lessons, you can learn a lot
so as you can see they are the same. They both use modals
Thank you in advanced
I wouldn't be misled by the modals.
Basically, a zero conditional has a definite result all the time. It's a statement of fact.
First conditionals depend on the likelihood of the "if-clause" happening. Then, a prediction is made.
That said, I agree that those two separate examples look confusing when placed together. I'd only guess the difference from my own perspective and not from the structure of the sentence.