What is difference between Shrimad Bhagwat puran and Shrimad Bhagwat Geeta?

In Hinduism, always a mythological book name is being to be heard as "Shrimad Bhagwat". Many of us don't know that it is not a single book, this is the name of two book. One is called aa Shrimad Bhagwat puran and another one is called as Shrimad Bhagwat Geeta. Yes, Bhagwat geeta is the part of Shrimad Bhagwat puran. Then, a question arises in mind, what is Bhagwat puran. Shrimad Bhagwat puran is the complete Biography of Lord Krishna. From his previous incarnation to life story of Lord Krishna comes under Shrimad Bhagwat puran. And Shrimad Bhagwat geeta is the preaching of knowledge to Arjuna during Kurukshetra war. Shrimad Bhagawat geeta having 18 lessons. In shrimad bhagwat puran, two time lord krishna has preached. First time, he had preached to Udhav about Bhakti yoga, later which is known as Udhav Geeta. In second time, Lord krishna had preached to Arjun for various kind of knowledge about karma, Bhakti, sanyas and gyan yoga. Actual meaning of Bhagwat geeta is " Song from Supreme almighty". 

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Jai Mahakaal. 🙏

Why five prime deities are considered as significance to worship?

In Hinduism, five deities like Lord Ganesh, Lord Shiva, Lord Vishnu, Lord Surya (Sun) and Goddess Durga are considered as Panch dev or Panchaitan. According to Hindu scripture, only these God and Goddess or sub form of these God and Godesses are capable to provide liberation from Birth and Death cycle (Moksha). These five deities are considered as chief among God and Goddesses.
First four Gods are male power and last one is female power. These five deities are the controller to five materials called Panmahabhut. Through which this universe is consist of. Those five Panchamahabhutas are Vayu (Air), Jal (Water), Agni (Fire), Prithvi (Earth) and Akash (Space).
As we know that Lord Vishnu ride on Garuda (Eagle bird), which indicate the material of Air. Lord Shiva ride on Nandi (Bull) which indicate the material of earth, Lord Surya (Sun) is the indication of fire. Godess Parvati or Durga is the master of water. Lord Ganesh ride on mouse means indicate speed means mind of any person represent the material of sky or space. Mind of some one is very unstable and agile, as similar to Mouse. Lord Ganesh is the master of mind power and intelligence. Lord Vishnu is the controller of wind power means lungs and air in bloods. Lord Shiva is the controller of earth power means muscular strength of body. Lord Surya (Sun) is the controller of fire power who regulate body temperature and bones. Lord Parvati is the controller of fluid power in human body like all blood, lymph and other fluids. Therefore, all these five chief deities are related to five materials of universe. Thousand year ago, rishi munis were more intelligent and they were knowing it's secrets. 

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Jai Mahakaal