Liquefied hydrogen and natural gas fuels are seeing increased interest due to low carbon content and high energy per weight. However, the cryogenic and flammable nature of these liquid fuels adds considerable difficulty for even seasoned experimentalists. This introductory course covers the basics of project startup with liquefied hydrogen or natural gas including fluid specific information on: 1) Thermophysical properties, 2) Liquefaction and Storage, and 3) Safety Standards and Applications. Participants will leave having completed basic calculations on thermophysical properties, examples for constructing cryogenic test equipment, and processes for developing safety plans.