What Is Cross-contamination?
Cross-contamination is transmission of microorganisms from contaminated surfaces to other surfaces.
There are some ways of cross-contamination. These are;

From stuff to food
From food to food
From equipment or other surfaces that contact to the food to food.

What Are The Sources Of Cross-contamination?

Uncleaned hands of the stuffs
Dirty surfaces, dirty cutting boards and work tops.
Equipments, [...]

The gold rule for safe food is cleanness. Before preparing meal and after touching raw meat or poultry products, hands should be washed wit hot water and soap for minimum 20 seconds.
Hairs should be covered by bonnet. The wound on hand should be wrapped by plaster.
All the utensils that used in kitchen should be well [...]

What Is Food Hygiene
Food hygiene is a notion which express preparing foods in healthy conditions. Clean and regular kitchen is accepted as a prerequisite.

Hygiene Rules In Kitchen
Everybody know that fruits and vegetables should not be consumed without cleaned well. But for healthy food, that is not enough, you should also know what should be kept [...]