Avatar or Expansion of Krishna: Garbhodakashayi Vishnu

                                                                  Q. Can you please explain me the difference/similarities between the above mentioned personalities - Vairaja Brahma (emerged from between the eyes of Vishnu), Hiranyagarbha and Brahma born from Garbodhakasayi Vishnu.

                                                                  I have come across some references in SB and Brahma Samhita, but still would like to know if Brahma is also called Hiranyagarbha, and also there are two Brahmas - one Brahma who emerged from between the eyes of Vishnu and the other Brahma from the lotus.

                                                                  It is also mentioned that the seminal principle is Hiranyagarbha where all the jivas are merged.

                                                                  Can you please explain these concepts?

                                                                  Q: Generally people know about Vishnu or Kshirodakasayi Vishnu. The general public has not heard about other Vishnu forms- Karanodayakasayi Visnu, Garbhodaka sayi Vishnu etc. and other expansions of Krishna: Immediate expansion as Balarama and subsequent expansions. Where in this information in sastras is available?
                                                                    We would like to know more about these details of different forms of Krishna's expansions and about Universal egg.
                                                                    
                                                                   

                                                                  Q: In the Introduction of the Krsna book (paragraphs 3 and 4), the following is stated. (Ellipsis are mine):
                                                                   "... when the Lord descends, the incarnation emanates from Viṣṇu. ... when Kṛṣṇa appears, all the Viṣṇu expansions join with Him. ... Kṛṣṇa actually appears in order to demonstrate His Vṛndavana pastimes and in this way attract the fortunate conditioned souls and invite them back home, back to Godhead. The killing of the demons in Vṛndavana was carried out only by the Viṣṇu portion of Kṛsna."