Rajayoga is, in its essence control of the mind and its energies just as hathayoga is a control of the bod and the life energies.
The Lord is the Ishwara, the Supreme Lord as the Creator of the Worlds, also known as the Purushottama, Paramatma, Parameshwara in Hindu thought.
She
The trinity are one. They are three aspects of One Being, the Purushottama of the Gita, the supreme Purusha of the Vedas, the Sacchidananda Brahman,
It is quite along the correct lines. Vedanta is limited to the two Purushas whereas the Gita brings in additionally the third Purusha or the
