Shankarachadia: Saguna brahman means god. It could be any of the abataras, in any particular form. A formless without form would become nirguna brahman. One may be meditating on god and visualizing for a lifetime. We know how people repeat the name of god near them when they are dying.
Swami Sarvapriyananda teaches Chapter 8 (Verses 5-7) of the Bhagavad Gita. In this series of talks, Swami Sarvapriyananda unfolds the highest truths of Vedanta through the study of the Bhagavad Gita (The Song of God).