Shri Krishna is the cause of all causes.
Krishna resides in Goloka in his original form its His home( who is very mischievous just as Krishna In Gokul his extension is Balram then further extensions. Then Finally we see Maha Vishnu (In duty form)
Maha Vishnu has millions of Vishnu.
Maha Vishu is the source of all universe of 14 planetary system.
Then Comes Garbhodakasayi Vishnu:
Garbhodakasayi Vishnu is within every universe in 14 planet system. There are 14 lok out of which 1 is Prithivi lok.
Garbhodhakaśāyī Vishnu He is the father of Brahmā who appeared from His navel .
Kṣīrodakaśāyī Vishnu. Kṣīrodakaśāyī-Viṣṇu resides in the heart of every living creature as a four hand expansion similar to that of Mahavishnu. He is also referred to as Paramātmā or super soul. His abode is the Vaikuntha. His personal abode is Kshirasagara (Milk Ocean) .
BG 14.27: I am the basis of the formless Brahman, the immortal and imperishable, of eternal dharma, and of unending divine bliss.
The previous verse may give rise to the question about the relationship between Shree Krishna and the formless Brahman. It was previously stated that the all-powerful God has both aspects to his personality—the formless and the personal form. Here, Shree Krishna reveals that the Brahman which the jñānīs worship is the light from the personal form of God. Padma Purāṇ states:
BG 10.40: There is no end to my divine manifestations, O conqueror of enemies. What I have declared to you is a mere sample of my infinite glories.
Shree Krishna is now concluding the topic of his opulences. From verses 20 to 39, he has described 82 of his infinite opulences. He now says that he has spoken only one portion (uddeśhataḥ) of the breadth of the topic (vistāraḥ).
BG 10.10: To those whose minds are always united with me in loving devotion, I give the divine knowledge by which they can attain me.
Divine knowledge of God is not attained by the flight of our intellect. No matter how powerful a mental machine we may possess, we have to admit the fact that our intellect is made from the material energy. Hence, our thoughts, understanding, and wisdom are confined to the material realm; God and his divine realm remain entirely beyond the scope of our corporeal intellect. The Vedas emphatically declare:
“Those who think they can understand God with their intellects have no understanding of God. Only those who think that he is beyond the scope of their comprehension truly understand him.”
The Bṛihadāraṇyak Upaniṣhad states:
sa eṣha neti netyātmā agṛihyoḥ (3.9.26)[v10]
“One can never comprehend God by self-effort based upon the intellect.” The Ramayan states:
rāma atarkya buddhi mana bānī, mata hamāra asa sunahi sayānī [v11]
“Lord Ram is beyond the scope of our intellect, mind, and words.” Now, if these statements on the topic of knowing God plainly declare that it is not possible to know him, how then can God-realization be possible for anyone? Shree Krishna reveals here how knowledge of God can be gained. He says that it is God who bestows divine knowledge upon the soul, and the fortunate soul who receives his grace is able to know him.
PriyankaSrivastava 