We live in times of huge technological development, the Internet is already available in almost every corner of the world. With electronic devices connected to a global network, we carry out a large part of our work and countless daily tasks. Day after day, we are exposed to the loss of our privacy and valuable data, so it is worth knowing how to protect ourselves from it. My short guide will explain to you the basic issues of network security, what malware is, how it works and how not to infect your device with it. I'll also give you some tips on how to surf the web and don't fall for the cheap tricks of cybercriminals. What you will learn? What is malware How can you protect your computer How to protect your data How to protect your smartphone What are the OS security features What is antivirus and which one to choose What is Deep Web and how it is work It is a great material for complete beginners who are just getting acquainted with the topic of Internet safety, but also a good reminder for more advanced network users. I wish you a nice reading and a successful study!