SQL Server Migration from 2008 R2 to 2016

I will have to move the databases from SQL Server 2008 R2 to 2016.. 

Currently, I am using SQL Server 2008 R2 which is installed in Windows 2008 R2 Operating System. Now my client wants to have SQL Server 2016 in new windows server(i.e. Windows 2012 R2). So I am planning to do server migration along with Database migration.

Could someone suggest on how to get the Database migration done in all possible ways.

Your help is much appreciated.

Please let me know if my ask is not clear.

Thanks