I am a kshatriya whose upanayana was done just before marriage in my 20s. My father doesn't do sandhyavandanam so I was never taught how to do it. I wanted to know what procedure of sandhayavandanam is prescribed for kshatriyas. Samavedam, yajurveda or rig veda. And is the procedure different for kshatriyas and how can I learn it from an authentic source