prasthāna traya bhāṣhya
The main study of vedanta is the prasthāna traya along with the bhāṣhya. The upaniṣhads are first studied, followed by the gītā and brahma sūtras.
The 10 upaniṣhads are studied in the order of the kārikā from the muktikopaniṣhad.
ईश केन कठ प्रश्न मुण्ड माण्डूक्य तैत्तिरिः।
ऐतरेयं च छान्दोग्यं बृहदारण्यकं तथा॥