The term Acharya is bestowed on a few.
An Acharya is one who can assess the disposition and talent of the discipline and teaches him what would suit him, presents Curriculum to suit him.
There are three types of teachers.
Acharya, whose qualifications are listed above.
Upadhyaya,who teaches the relevant portions of the Veda, depending on one’s disposition, Varna.
Guru is one who reaches out to you depending on your passion to realize Self, guides you in a spiritual path suitable to you.
He does not accept any offerings.
He might demand your leaving some of your inclinations, which might impede your spiritual development.
He is the Ultimate Preceptor.
Dronacharya was a Guru, a disciple of Parashurama, an Avatar of Vishnu.
Drona was not born of a womb, he was nurtured in a Leaf, hence his name, Drona.
He was the son of Bharadwaja, a great Sage.
Drona is considered to be an Avatar of Brahma, Vishnu and Shiva combined.
He was the father of Aswathama, an Immortal.
Drona was the teacher of both The Pandavas and Kauravas.
He fought against the Pandavas for the Kauravas and was killed by Dhristadhyumna in the Mahabharatha war.
The grandsire of Kuru Dynasty, Dhritharashtra offered him a village as Dakshina for having taught the Princes, Kauravas and Pandavas.
IT was called the ‘Village of the Guru,’, Gurugaon.
IT is the city of Gurgaon, near New Delhi and there is a tank named after Drona, Dronakund.
Gurgaon district is situated in NCR of Delhi, the capital of India. It is just 10 kms away from Indira Gandhi International Airport, Delhi. The district derived its name from the name of Guru Dronacharya; the village was given as gurudakshina to him by his students; the Pandavas and hence it came to be known as Guru-gram, which in course of time got distorted to Gurgaon. Thus the district has been existence since the times of Mahabharata. The district is surrounded by Delhi & Rajasthan.
It is said that Yudhishtar, the eldest brother among the Pandavas, gave this village to his guru, Dronacharya, whose tank still exists on the west side of the Railway Road. Actual village “GURGAON” is about 1.5 km. away from Gurgaon town, where the temple of SHEETLA MATA, attracts devotees in large numbers on every Monday and Tuesday.‘
Reference and Citation.