The most important part of an AWS project is to stick to the AWS Well-Architected framework's pillars, including (but not limited to):

- Operational Excellence (Perform operation as code)

- Security (Implement a strong identity foundation : Implement the principle of least privilege)

- Reliability (Scale horizontally to increase aggregate workload availability and Stop guessing capacity)

- Performance efficiency (Use serverless architectures)

- Cost optimization (Adopt a consumption model, pay for what you use)