Server

Many people prefer to use nginx, but for Magento it makes no difference since the PHP process is the big villain and not static content.

"AWS Database Migration Service helps you migrate databases to AWS easily and securely. The source database remains fully operational during the migration, minimizing downtime to applications that rely on the database. The AWS Database Migration Service can migrate your data to and from most widely used commercial and open-source databases." - https://aws.amazon.com/dms/

Redis is memory-based key-value. Imagine Memcache with more tools such as clustering and multiple databases.

Magento can use Redis to:

• Session
• Cache
• Full Page Cache (Enterprise)

What is the reason to use Redis?