@habdallah

Greeting dear friend

In the introduction you told that it was not possible to fetch data from the external word as there was no medium for intermediate. Lack of Bridge for this transfer and hence blockchain was facing many issues in data transfer.

But now these issues has been solved by the knowledge of the option oracles as it act as a mediator for the connection of data on the contract to external world and make it possible for the transfer of data from one source to real word.

You have explained different type of oracles and mainly touch all the types with a good examples especially centralised and decentralized Oracle, in bound and outbound and human conseus oracles.

You explain in detail why the centralised oracles are becoming familiar as it is using multiple nodes system and if 1 or 2 notes are broken data couldn't be waste as it is working on a large scale and make data accuracy more possible as compared to centralized system which is working on only one node and the chance of losing data was more.

Wish you very good luck and success