Web applications for distance learning and teaching using video lessons are often used today to expand or acquire new knowledge. This paper describes the basic concepts that such an application should have. Popular technologies and their working principles are discussed. In addition, instructional models are described that greatly help in creating pedagogically quality video lessons. Crodemy is an application intended for learning and teaching through video lessons whose role is to bring technology closer to Croatian-speaking students. The entire application is made in the Croatian language in order to make the professional terminology more understandable to the user from the territory of the Republic of Croatia. The motivation for the work is the language barrier and the appearance of the COVID-19 virus in 2019. The platform is modeled on well-known web applications of this type such as: Udemy, Coursera and Khan Academy. It allows the user to log in and register and view available courses. All courses on the application are free and the user can enroll only if he is registered or logged in. Each course consists of several video lessons in which an individual can acquire basic knowledge and programming concepts in ReactJS, Python courses for adults or Micro:bit, which is intended for all age groups. Crodemy is a prototype application that has room for development and with further progress should serve as an additional source of knowledge in addition to the classic educational content offered by the education system.