What is the biosecurity note to be taken into account in the 'Microbiology at Home (Artisanal Culture Media)' guide?

Hand washing and application of alcohol on hands and surfaces to disinfect.
All glass and metal elements can be boiled in water for at least 15 minutes for sterilization.
Maintain aseptic conditions throughout the process for containers, utensils, and surfaces.
Be careful not to approach your hands to the flame of the candle or stove, after applying alcohol, they could suffer burns.