The PDF stresses that safe tattooing requires a level of cleanliness "as clinical as a hospital". You must learn the difference between sanitizing, disinfecting, and sterilizing. The only acceptable way to sterilize reusable equipment like tubes and needle bars is with a properly functioning autoclave. Your apprenticeship will test your discipline on this subject more than your art.
Your tattoo machine is a tool of precision. The "Basic Fundamentals" manual spends significant time on building and tuning these tools.
How to Optimize Your Tattoo Textbook PDF for Mobile and Tablets