apache is a popular open source web server.
1. Update Repository
2. Install Apache
apt install apache2
3. What you need to know
You now have a web server and can access your default homepage by entering the IP address for your server (and/or any domain pointng to it) in your web browser's address bar.
Default Web Directory
You can store the files for your default web site in "/var/www/html"--in that directory you will find your default index.html (which can be safely deleted).
Default Configuration File
Your web site's server configuration file can be found at "/etc/apache2/sites-enabled/000-default.conf".