Hello friend. In case you are not familiar with Docker and want to learn more, please spend some time researching this page: https://docs.docker.com/engine/docker-overview
If you know what it is or your main goal right now is just spin up the repo, feel free to skip docs and proceed.
If you don't have docker installed: https://store.docker.com/search?type=edition&offering=community Find installer that matches your platform and install it.