Brahman

Can you explain Brahman and Paramatma realizations in detail?
Is Krishna brahman or parabrahman?
Is the Brahman aspect also sat-cit-ananda or is it only sat?
Does Brahman always refer to the Lord’s effulgence?
How is Paramatma realization an evolution from Brahman realization?
Is Brahman the effulgence of the Absolute or is it the realization of our own eternality?
Does Gita 6.28 refer to brahman or to bhakti to bhagavan? (Bhagavad-gita)