There are many different way to tell if the device you are using is truly safe. The first way you will know is if you keep your antivirus up to date. Antivirus programs simply scanned files for signature patterns of known threats. Which means if it is kept up to date then it will easily be able to stop and detect certain threats. The second way to tell is by making sure you are using the best and strongest security software. Make sure the passwords used for the software are strong, frequently check VPN, and overall make sure your system connected to the proper software. One of the main things would be receiving hep from experts, when you get help from the individuals that know exactly what they are doing it will. be easier upon yourself.