In Uttara-kāṇḍa of Vālmīki Rāmāyaṇa, we see Vālmīki narrate the story of Śambūka. Questions: Why did Rāma kill Śambūka? Is it because Śambūka was a śūdra or is it because he was doing tapasya for the wrong reasons? Were śūdras not allowed to become a ṛṣi? And is Rāma justified in killing him w...

I have heard lot about this mudra and its benefits and online text have different different version of it. If any one can explain me in full detail with pictures, quoting the relevant texts and scriptures and how one can master it.