Add an index page for API Usage best practices

docs/tutorials/best-practices/api-usage/index.md

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+---
+seo:
+  description: Best practices for efficiently and reliably interacting with the XRP Ledger API, including pagination, data handling, and performance optimization.
+labels:
+  - Best Practices
+---
+# API Usage
+
+Efficiently interact with the XRP Ledger API by following these best practices for querying data, handling large datasets, and optimizing your application's performance.
+
+When building applications that integrate with the XRP Ledger, proper API usage ensures reliability, efficiency, and scalability. 
+
+The following code samples cover essential techniques for working with API responses, including:
+
+* [Pagination and Markers](_code-samples/markers-and-pagination/README.md): Handle large datasets that span multiple responses by properly using markers to iterate through results without missing data or overloading your application.
+
+* [Data Normalization](_code-samples/normalize-currency-codes/README.md): Convert XRP Ledger data formats into human-readable formats, such as transforming currency codes from hexadecimal to standard representations.
+
+* [Rate Limiting](docs/references/http-websocket-apis/api-conventions/rate-limiting.md): Understand and work within API rate limits to maintain consistent access and avoid service interruptions.
+
+* [Error Handling](docs/references/http-websocket-apis/api-conventions/error-formatting.md): Implement robust error handling strategies to gracefully manage network issues, invalid requests, and unexpected responses.
+
+These practices help you build more resilient applications while minimizing unnecessary load on XRP Ledger servers.