The Cloud Controls Matrix by Cloud Security Alliance (CSA) has always been the go-to standard when it comes to securing the cloud environment. The matrix itself is developed alongside industry players, cloud service providers, governments, and enterprises, making it the most comprehensive security standard on the market.
The latest update, the Cloud Controls Matrix 3.0.1, includes additions based on the security challenges of today. The matrix is designed to be a list of best practices and must-follow approaches, so it is easy to implement even when you have no specific expertise in cloud security. On top of that, the matrix is available for free.