Biostatistical methods are currently one of the cornerstones of modern health sciences research. Open-source statistical programs are powerful, free tools for data management and advanced statistical analysis. JASP is one of the main open-source statistical software currently available worldwide. One of the possible facilitators for a broader use of open statistical software might be the availability of basic tutorials, which might be quite helpful for novel users. In this manuscript, we provide a user-friendly tutorial for basic statistical analyses using the open JASP software. The following statistical analyses are covered, with examples of the respective menus and of the resulting tables and figures: Descriptive statistics, normality testing, comparison of means between two groups, comparison of means between three or more groups, contingency tables and Pearson correlation. Promoting and facilitating, through detailed tutorials, the adequate implementation of user-friendly and open statistical software might contribute to the training of scientists around the world. The use of open software, in addition to facilitating access to researchers in environments with limited economic resources, has advantages in terms of reproducibility and transparency.