DevOps is generic term for many things. It can also contain AWS. If you look at AWS certificates, there is also one for DevOps.
In general you need plenty of different skills to work at DevOps. Many organizations are using cloud services (AWS, Azure, Google), you should know the one they’re using. Many organizations has Linux, then you must know at least the basic Linux administration. If they’re Microsoft house, then you have to know how to administrate the Windows servers.