As a backend engineer you should be familiar with the concept of files and the file systems. You can make a website by installing nginx from your repositories a

As a backend engineer you should be familiar with the concept of files and the file systems. You can make a website by installing nginx from your repositories and making an index.html file (<html><head><title>Calculators</title></head><body>...</body></html>) and transferring it, and your spreadsheet files, to your distro's www directory. Link the files in your index.html like, <a href="/spreadsheetone.xls">Calculator for tax</a>. Then forward port 80 on your router to the port 80 on the internal LAN IP address of your computer running nginx. Providing the actual spreadsheet files directly will be of far more use to other people than trying to turn them into an inferior website.