Migrating to Google Cloud Platform (GCP) is a structured process that can significantly enhance your IT capabilities. Here’s an overview of the steps and considerations for GCP Cloud Migration:

1. Assess: This initial phase involves evaluating your applications and workloads for suitability to the Google Cloud. Factors like hardware, performance, licensing issues, compliance, and dependencies between applications are considered. Divide your apps into categories such as ‘Easy to Move’, ‘Hard to Move’, and ‘Can’t Move’​​​​.

2. Pilot: Start by migrating one or two applications, ideally those that are easier to move. This phase helps in understanding the cloud environment and validating performance. It’s important to plan for a rollback if necessary​​​​.

3. Move Data: Google recommends moving all your data to the cloud first, then the applications. This approach ensures a smoother transition of applications, as many have data dependencies. Various methods like batch data transfers and offline disk imports can be used for moving data​​​​.

4. Move Applications: After data migration, the next step is to move applications. This can be done through direct “lift and shift” or by rebuilding applications in the cloud. Continuous monitoring during this process is crucial​​​​.

5. Optimize: Once the applications are running in the cloud, look for ways to improve them. This could include making apps redundant across GCP availability zones, setting up disaster recovery, autoscaling groups, and using Google’s Stackdriver for monitoring​​​​.

In addition to these steps, GCP offers various tools and services to facilitate migration, such as Migrate for Compute Engine for application transfer, Cloud Foundation Toolkit for setting up a secure cloud environment, and Database Migration Service for database migration. For large-scale data transfers, the Transfer Appliance can be used, and the Rapid Migration Program (RaMP) offers resources and support for quicker migration​​.

For a successful migration, understanding your current infrastructure, having a clear strategy, and leveraging the available GCP tools and services are key. The process can vary in duration depending on the complexity and size of the workload. It’s also vital to consider security aspects during migration, for which GCP employs robust encryption and secure data transfer channels.

For more detailed guidance and resources on GCP migration, you can explore tutorials and best practices provided by GCP experts.