Getting started on Google Cloud (GCP) can be daunting, to start:

1. Google Cloud has a vast array of services covering computing, storage, databases, machine learning, and more. This sheer volume can make it difficult to know where to start and how to best combine services for your needs, and build the appropriate gaurdrails around them.
2. Then GCP uses a hierarchy of Organizations, Folders, Projects, and Resources. Understanding the purpose of each and how they relate is critical to proper structuring.
3. Identity and Access Management (IAM) provides granular control over permissions but has a learning curve. Balancing security with ease of use requires careful planning.
4. Organizational Policy constraints enforce rules across your GCP environment. Choosing the right policies is crucial for compliance and governance.