Is there any limit to the number of VPCs, subnets, gateways, VPNs that I can create?

Hi,

It is all detailled here: https://docs.aws.amazon.com/vpc/latest/userguide/amazon-vpc-limits.html

VPCs per Region :	5	
Subnets per VPC :	200	
IPv4 CIDR blocks per VPC  :  5
IPv6 CIDR blocks per VPC :	5

Above is for VPCs, subnets and CIDR blocks, but go to the page for gateways, DNS, EIPs, etc.

Best,

Didier