Nowadays, technology plays a very important role in the lives of people, especially adolescents/teenagers, who use it very often for communication and entertainment, as well as for learning. For this reason, when developing appropriate technological solutions, it is necessary to apply user-centered design, which puts future users, their capabilities and limitations at the center of the development. In the theoretical part of this thesis, the concept of Teen-Computer Interaction (TeenCI) is introduced, relevant challenges are presented, and the importance of understanding the specific needs and inclinations of teenagers in relation to the design of interaction and web interfaces is considered. Based on the conducted research and taking into account the specifics of the target users, a prototype of the educational site was designed. By applying different methods for testing usability and simplicity of use, the evaluation of the initial design of the web interface was carried out.