$ sudo apt install apache2

$ sudo systemctl status apache2.service

$ sudo ufw allow http

$ http://your_server_ip
Use hostname -I to get your sever ip

$ sudo systemctl start|stop|restart|reload apache2.service

$ sudo systemctl enable apache2.service
Enable Apach to start automatically when server boots.

$ sudo mkdir /var/www/your_domain

$ sudo vim /var/www/your_domain/index.html
<html>
 <head>
  <title>your_domain</title>
 </head>
 <body>
  <h1>Welcome to your_domain</h1 >
 </body>
</html>

$ sudo vim /etc/apache2/sites-available/your_domain.conf
<VirtualHost *:80>
  ServerAdmin webadmin@localhost
  ServerName your_domain
  DocumentRoot /var/www/your_domain
  ErrorLog ${APACHE_LOG_DIR}/error.log
  CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Use port 443 instead of 80 if you intend to use HTTPS instead of HTTP for the website.

$ sudo apache2ctl configtest
Example Output
Syntax OK

$ sudo a2ensite your_domain.conf
Enable website

$ sudo systemctl restart apache2.service

$ http://your_domain
Check if your website opens.

Other related commands.

$ sudo a2dissite your_domain.conf
Disable website.

$ sudo systemctl disable apache2.service
Disable Apache to start automatically when server boots.