What did the Buddha do, and what does a teacher do, to teach? When the teachings of Buddha are crystal clear i.e 1+1=2, then no need to be labelled.

I humbly place my question as below.

When buddha gave diksha, what he did: is that was the imparting of knowledge?

And in the path of Buddha, once known, is to be walked upon by individual: then, how the teacher is useful? Whether he pushes us ahead by using his jhanic powers, or resolves our difficulties?

Because in Hinduism there is mention of shaktipat by guru. Is it the same in Buddhism also?
At least in the Theravada tradition, there is no mystical energy seed that needs to be transferred from the teacher to the disciple through a medium like touch or speech, in order to kick-start the disciple's spiritual growth.

Rather, the teacher teaches the Buddha's Dhamma (teachings) using his own knowledge, experience and insight, much like how a mathematics teacher teaches mathematics to others.

The teacher must have the following qualifications according to the Udayi Sutta:


  "It's not easy to teach the Dhamma to others, Ananda. The Dhamma
  should be taught to others only when five qualities are established
  within the person teaching. Which five?
  
  "(1) The Dhamma should be taught with the thought, 'I will speak
  step-by-step.'
  
  "(2) The Dhamma should be taught with the thought, 'I will speak
  explaining the sequence [of cause &amp; effect].'
  
  "(3) The Dhamma should be taught with the thought, 'I will speak out
  of compassion.'
  
  "(4) The Dhamma should be taught with the thought, 'I will speak not
  for the purpose of material reward.'
  
  "(5) The Dhamma should be taught with the thought, 'I will speak
  without hurting myself or others.' (see Note)
  
  "It's not easy to teach the Dhamma to others, Ananda. The Dhamma
  should be taught to others only when these five qualities are
  established within the person teaching."
  
  Note:
  According to the Commentary, "hurting oneself" means exalting oneself.
  "Hurting others" means putting other people down.