I didn't see this one mentioned. Use VPC end points for S3 to save cost. If you are using NAT gateways and S3 (probably applies to Dynamo as well) and your ap

I didn't see this one mentioned. Use VPC end points for S3 to save cost. If you are using NAT gateways and S3 (probably applies to Dynamo as well) and your app is using S3 then you could be saving $$ by having that traffic run through a VPC endpoint which is free bandwidth and not using the NAT gateway which is paid.