How can internet users infringe on copyrighted material?

Copying the work of another person and posting it on the Internet is usually how infringement occurs. To avoid copyright claims of another person - be creative - make your content all by yourself - or use materials that are in the public domain. Search for public domain information on the Internet - it will be old - but could be very useful to you. If you want to use the work of a known author - as for permission. If granted - you will be okay. Otherwise - create your own work.