Current secondary and university students use their technological devices not only in playtime but also in study time. Our proposal makes use of this fact to create educational content that can be viewed on any smartphone or computer. These videos can be used to teach new concepts, mathematical procedures or problem-solving resolutions. Although there is a wide variety of educational videos and MOOCs, on many occasions these videos do not fit in terms of content or notation. With this in mind, in this article, we define the detailed process that we should follow if we are interested in creating our own educational videos. We devote special attention to giving advice on video creation from a methodological point of view. This process is enhanced with an example of learning unit collection that we created at the University of La Rioja. The project that we present is a collection of math Olympiad problem-solving strategies that can be used as complementary learning materials.