Check out example codes for "ubuntu install mysql". It will help you in understanding the concepts better.
Code Example 1
sudo apt install mysql-server
Code Example 2
sudo apt install mysql-server
sudo mysql_secure_installation utility
Code Example 3
sudo add-apt-repository 'deb [arch=amd64,arm64,ppc64el] http://ftp.utexas.edu/mariadb/repo/10.3/ubuntu bionic main'
Code Example 4
mysql -u root -p
Code Example 5
sudo apt update
sudo apt install mysql-server
sudo mysql_secure_installation
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