First of all Make sure your system is up to date, To do that, type the following command

sudo apt update && sudo apt upgrade

Step 1 - Install Apache 2 server

To install apache server run the following command

sudo apt install apache2

Step 2 - Make sure Apache service starts on system boot

To check that run the following command

sudo systemctl is-enabled apache2.service

If you get Output similar to the image below then you are good to go

If your Output is not similar to the Image then run the following command to enable Apache service on boot

sudo systemctl enable apache2.service

Step 4 - Make sure your Apache server status is active

To check the status run the following command

sudo systemctl status apache2.service

If server status is active (running) then everything is fine, up and running

Step 4 - Open Apache port 80 and 443

To open port 80 and 443 use the following commands

sudo ufw allow 80/tcp
sudo ufw allow 443/tcp

if you are Configuring a cloud server then make sure to allow ssh so that you don't get locked out of your server. Run the following command to allow SSH

sudo ufw allow openssh

Now Enable the firewall

sudo ufw enable

Check Status of firewall

sudo ufw status

It should look like this

Step 5 - Test your Apache server

Test Using terminal

curl -I http://<your-server-ip-address>/

To Test Using Web-Browser, Simply type your servers ip address in the address bar,and you should get output like this