The course is an introduction to the procedures for safe handling of hydrogen, flammable and toxic gases by small users working in the field of hydrogen and fuel cells. Theoretical and practical aspects are emphasized, aiming at identifying the main hazards and reduce the risks associated with the use of these gases. Topics: 1. Market, hydrogen production, fuel cells, and energy storage; 2. International System of Units, Comparison between the ideal gas and real gases; 3. Safety of gases and hydrogen; 4. Cylinders, fittings and valves for gases and hydrogen; 5. Purge of gases; 6. Infrastructure for gases and hydrogen; 7. Accidents with hydrogen.