EC2 has many instance types, but choosing the most powerful instance type isn't the best choice, because the cloud is elastic
Right sizing is the process of matching instance types and sizes to your workload performance and capacity requirements at the lowest possible cost
Scaling up is easy so always start small
It's also the process of looking at deployed instances and identifying opportunities to eliminate or downsize without compromising capacity or other requirements, which results in lower costs
It's important to Right Size...
before a Cloud Migration
continuously after the cloud onboarding process (requirements change over time)
CloudWatch, Cost Explorer, Trusted Advisor, 3rd party tools can help