What is the process of Detaching the database. what are the secured steps?

Just right click on your database and go to the task menu item and there you just click detach and it is detached. Until SQL Server2012, it is the same.

Click this link to see steps for Detach a Database:

https://msdn.microsoft.com/en-us/library/ms191491.aspx

Click this link to see steps for attach a database:

https://msdn.microsoft.com/en-us/library/ms190209.aspx