PostgreSQL, commonly referred to as "postgres", is a relational database management system that provides an implementation of the SQL querying language. It was built to be standards-compliant and has many advanced features like reliable transactions and concurrency without any read locks.
This tutorial will walk you through how to install PostgreSQL on Ubuntu 20.04.
How to Install PostgreSQL on Ubuntu 20.04
To begin with run an apt-update command:
sudo apt update
Then, install PostgreSQL:
sudo apt install postgresql postgresql-contrib
And... that's it. PostgreSQL is now installed and available on port 5432.
Should you have any trouble, send me a message and I'll do my best to help out.