By leasing a web server, you have rented business premises on the Internet. The method of operation and the security of documents on the server are your job. You regularly clean your office; you tidy up the documents in it, change dead light bulbs and lock it. Similar maintenance tasks await you on the web.
Download the full paper from here - https://vni.cert.si/wp-content/uploads/sites/3/2013/11/ABC_Of_Security_For_Website_Owners.pdf