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](https://en.wikipedia.org/wiki/Shaktipat) by guru. Is it the same in Buddhism also?