“Shivo” means pure consciousness, god Shiva, “ham” means “I, me”. So, shivoham can be transalted as “I am the pure consciousness”. This is a very beautiful, powerful and simple mantra.
Short Instruction. Sit comfortably and straight in a meditation position. Close your eyes, turn on music and chant “Sivoham” together with Anandmurti Gurumaa for 15-30 minutes.