How do we know is the product of food is real organic or not ? And at the same time is organic food taste the same as non organic ?

Organic meat and eggs generally taste better than non organic meat and eggs. No difference with vegetables and fruits. The differences with animal products being more noticeable is because animals packed in conventionally have to be given huge amounts of antibiotics to keep them from dying. These crowded conditions yield bland meat and eggs. They have to be fed a slightly more diverse range of foods to keep them healthy. You will notice the difference with eggs, absolutely. The meat will be slightly more flavorful.