is their any institute or college that can grow knowledge about bitcoin? or any other way to get clean knowledge?
I don't think there is any course available to study about bitcoin but there are lots of book available to bitcoin so where you can learn about bitcoin and the blockchain technology.And online is the another source where you can get videos about bitcoin and the forum is also the main source so do your own research and get more knowledge.
I agree that books can be a great source of information for crypto. I perosnally love Andreas Antonopoulos - the Internet of Money.
However, in regards to courses - The University of Berkeley teach have a blockchain course that can be accessed for free online. Its very in depth - would recommend. They also have a course for developers.I will post the links of both below. Furhtermore, princeton university also teach a Bitcoin course. Once again, its pretty extensive. These are two very well respected institutions, there is lots to learn from both.
Berkeley -
https://blockchain.berkeley.edu/decal/sp18/fund/Berkeley Developer Course -
https://blockchain.berkeley.edu/decal/fa17/dev/Princeton Course -
https://www.coursera.org/learn/cryptocurrencyEnjoy!