As part of the course, participants will learn the techniques used by government and military intelligence, intelligence services, CIA and FBI agents to search for information using open sources. In this course we will explain what OSINT is and how it works, we will talk about other areas such as HUMINT, SOCINT, GEOINT and others. We will learn to use tools and get information automatically, work with photo metadata and geolocations and track people using online cameras. The entire course is accompanied by a series of hands-on labs so that the participants can master the given techniques and begin to understand the functioning of intelligence services, focusing on the physical, digital and human aspects. At the end, the participants will get a homework assignment to create a complete digital profile of the organization, with a deadline in 7 days. In this way, the participants will understand the weaknesses of the organization which could be used by a potential attacker when planning an attack on its infrastructure. The output of this screening is then discussed with the lecturer, and each course participant has 1 hour to explain the most important points of the entire report. The participants are awarded their certificate after they defend their outputs. This methodology is used not only by the armed forces of various countries, but also by researchers who try to identify the weak points of companies. The OSINT methodology is further used in the screening of employees who may work with sensitive information after joining, in order to verify their confidentiality and integrity.