recently I'm trying to create ingress gateways per API I create, I need to know that is there any limit for that, or can we create as many as I want?
The exact answer depends on which Ingress Controller you are using, but if there are limits for any of them, expect them to be in the billions (like the kind of limit where 2^32 or 2^64 are involved because there's an integer index on something somewhere).