en overview for the deployments section

docs/user-guide/deployments/overview.md

@@ -1 +1,28 @@
-# Overview
+# Overview
+
+## Configuration
+
+Before deploying GreptimeDB, you need to [configure the server](configuration.md) to meet your requirements. This includes setting up protocol options, storage options, and more.
+
+## Authentication
+
+By default, GreptimeDB does not have authentication enabled. Learn how to [configure authentication](/user-guide/operations/authentication.md) for your deployment.
+
+## Deploy on Kubernetes
+
+Follow step-by-step instructions for [deploying GreptimeDB on a Kubernetes cluster](./deploy-on-kubernetes/overview.md).
+
+## Run on Android
+
+Find guidelines for [running Greptime on Android devices](run-on-android.md).
+
+## Capacity plan
+
+Understand how to [plan for capacity](/user-guide/operations/capacity-plan.md) to ensure your GreptimeDB deployment can handle your workload.
+
+## GreptimeCloud
+
+Instead of managing your own GreptimeDB cluster,
+you can use [GreptimeCloud](https://greptime.cloud) to manage GreptimeDB instances, monitor metrics, and set up alerts.
+GreptimeCloud is a cloud service powered by fully-managed serverless GreptimeDB, providing a scalable and efficient solution for time-series data platforms and Prometheus backends.
+For more information, see the [GreptimeCloud documentation](/greptimecloud/overview.md).