Fireship explains Terraform in 100 seconds.

Terraform is an Infrastructure as Code (IAC) tool that can provision resources in the cloud. Learn how to setup terraform and connect it to cloud providers like AWS, Google Cloud, Azure, or Docker to automate your infrastructure

Redis is an extremely fast in-memory database often used as a cache. It has evolved into a multi-model database with support for graphs, JSON documents, full-text search, and more.

Fireship explains it all in 100 seconds.