This manual instructs a desirable behavior in relation to safety, health and welfare conditions on construction sites. It teaches possible solutions to the problems that one may encounter. It covers many aspects of the work on construction sites, such as safety organization and management, site planning and layout, excavations, scaffolding and use of ladders, hazardous processes, movement of materials, working positions, tools and equipment, working environment, personal protective equipment, and welfare facilities. The training is addressed mainly to employees in the construction sector, that is: workers, worker representatives and supervisors. It is indicated that the manual is also useful for employers and managers, while important parts of the content (questions, illustrations, checklist) can be used for training purposes. The manual (134 pages) can be downloaded and can be printed for immediate use. The manual presents a lot of situations and recommendations for safe work and a safe work environment. On every topic, questions are presented that test whether the essentials are kept. No answer sheets are provided for these questions are provided. However, the answers can be found in the text.