School children across Kent and Sussex have been given advice on how to keep safe online.
Parents have been urged to think where they put their computers
The lessons and special awareness raising events were held in schools and colleges to coincide with Safer Internet Day on Tuesday.
Parents are also being encouraged to take an interest and be on hand to help protect their children.
Kent Police Pc Martin Carter said it was important internet users did not ignore the potential dangers.
He added: "Parents can make a difference. Filtering and blocking software should be put in place and parents should think about where the computer is placed.
"Too many children have an unprotected computer and webcam, often to be found in their bedroom where they are unsupervised."
More than 1,000 pupils at the Hartsdown Technological College in Margate have been trained about potential online dangers and how to report anything suspicious.
Advice is now being offered to parents and the staff and governors of nearby primary schools.
There are also free courses for parents and people who care for children at the Kip McGrath education centre in Bexhill, East Sussex.
Centre director Steph Dudson said: "The course is to give parents an idea of how their children use the internet, the types of things they are likely to do, and to give parents a better understanding of those websites, and how to monitor them."