I have followed a tutorial how to create "typical" aws configuration see the picture.
At the picture NAT instance is actually NAT Gateway.
My question is, how can and where to add ELB and autoscaling group to this configuration? What to do with EIP, how it should I do with it since I would add ELB? If I add ELB do I still need EIP? Very confused about what is going on here...
Also, I am aware that I need Bastion instance in order to access to these instances, but to be honest don't know where to add it without violating security of security groups?
Please sorry if I am asking generic question, I am newbie with AWS and trying to learn/understand how and when to use these services.