Separate the Lambda handler from your core logic.

Take advantage of execution environment reuse to improve the performance of your function. 

Use a keep-alive directive to maintain persistent connections

Use environment variables to pass operational parameters to your function

Control the dependencies in your function's deployment package. 

The most popular serverless compute platform that is using millions of customer

▪ Running billions of invocations all over the world

▪ What is AWS Lambda

▪ Overview

▪ Core Concepts

▪ Example Use Cases

▪ Main Features

▪ Best Practices

▪ Walktrough AWS Console – Create Function Run and Test

▪ What is AWS Lambda

Compute service that runs code without thinking any servers or underlying services

▪ Serverless function that you only responsible for your actual code. 

https://docs.aws.amazon.com/lambda/latest/dg/welcome.html