Please enlighten me on the issue of jinns being the teacher of someone.

Answer

If a jinn is a pious Muslim, and he teaches someone of his own free will without him having been subjugated by some amal, it will be permissible. It is haraam to subjugate/enslave a jinn because jinn are free just as humans are. There were some pious people in the past who had acquired knowledge from jinn. Hadhrat Shah Waliyullah (rahmatullah alayh) had heard 40 Ahaadith from a Sahaabi jinn.