Environment used

Ubuntu 18.04.5 LTS  GNOME 3.28.2   OS type 64bit
Apache/2.4.29

So, before I begin you should mainly have apache installed of above said version on your pc.

I assume here following:
1. the root folder of apache web server is /var/www/html/
2. the apache configuration folder is /etc/apache2
3. YOURUSERNAME is to be replaced by username of your ubuntu installation.
4. You know how to create/edit a file in text editor on linux
5. You know how to create a link on linux
6. You have prior experience of installing programs in linux via command line.
7. You can access your webserver via browser with http://127.0.0.1/
8. You know how to restart apache server on linux pc.