Certificate of Airworthiness and how do you maintain it?

What is  C of A ( certificate of Airworthiness)? and how do you maintain it?

C of A is a legal document issued by the Airworthiness authority of the country where the Aircraft is resgistered in on the basis that the specific aircraft conform to the requirement of the authority.

Flight manual is a part of C of A.

Aircraft or any of its equipment that is necassary to keep the aircraft Airworthy must be maintained in a manner approved by the competent authority.

Any part if the aircraft or its equipment removed must be replaced with the type Approved by the competent Authority.

All inspections and modifucations deemed by the competent authority must be carried out within the prescribed time period.

Scheduled maintenance and inspection required by the competent Authority schedule maintenance schedule must be carried out in a manner approved by the authority.

Aircraft must be maintained in accordance with a Competent authority approved schedule.

All CRS, CMR, and CRS-SMI must be in force and valid.