Adding content to 109-backend-implementations

src/roadmaps/graphql/content/109-backend-implementations/100-graphql-http.md

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-# Graphql http
+# GraphQL HTTP
+
+GraphQL HTTP is a specification for serving GraphQL over HTTP. It defines a standard way of sending GraphQL queries and mutations over the HTTP protocol, and it is widely supported by GraphQL servers and clients.
+
+The GraphQL HTTP specification defines two main HTTP methods:
+
+- **POST:** Used to send queries and mutations to the server. The query or mutation is sent in the request body as a JSON payload, and the server returns the result in the response body.
+- **GET:** Used to send queries to the server, but it's not recommended to use GET for queries because it's not as efficient as POST method.
+
+Learn more from the following links:
+
+- [Overview of GraphQL HTTP](https://graphql.org/graphql-js/express-graphql/#graphqlhttp)
+- [Get Started with GraphQL HTTP](https://graphql.org/learn/serving-over-http/)

src/roadmaps/graphql/content/109-backend-implementations/101-graphql-yoga.md

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-# Graphql yoga
+# GraphQL Yoga
+
+GraphQL Yoga is a popular open-source GraphQL server library for Node.js. It is built on top of the popular Express.js web framework and provides a simple and flexible way to build GraphQL servers with minimal boilerplate code.
+
+One of the key features of GraphQL Yoga is that it provides a set of built-in functionality that makes it easy to handle common tasks such as authentication, authorization, and data validation. It also provides support for subscriptions, which allow clients to receive real-time updates from the server.
+
+Learn more from the following links:
+
+- [Tutorial - GraphQL Yoga](https://www.youtube.com/watch?v=_-B6QIFSSwo)
+- [Examples of GraphQL Yoga](https://codesandbox.io/examples/package/graphql-yoga)

src/roadmaps/graphql/content/109-backend-implementations/102-apollo-server.md

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-# Apollo server
+# Apollo Server
+
+Apollo Server is a popular open-source library for building GraphQL servers in JavaScript. It provides a simple and flexible way to build GraphQL servers by providing a set of tools and features for handling common tasks such as parsing and validating queries, executing resolvers, and formatting responses.
+
+One of the key features of Apollo Server is that it provides a set of built-in functionality that makes it easy to handle common tasks such as authentication, authorization, and data validation. It also provides support for subscriptions, which allow clients to receive real-time updates from the server.
+
+Learn more from the following links:
+
+- [Apollo Tutorial - Introduction](https://www.howtographql.com/react-apollo/0-introduction/)

src/roadmaps/graphql/content/109-backend-implementations/103-mercurius.md

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 # Mercurius
+
+Mercurius is an open-source library for building real-time GraphQL servers in Node.js. It provides a simple and flexible way to build GraphQL servers by providing a set of tools and features for handling real-time subscriptions.
+
+One of the key features of Mercurius is that it is built on top of the popular WebSockets protocol and it allows the client to subscribe to real-time updates from the server. It also supports batching and caching of queries and mutations, which allows for efficient and fast data transfer between the client and server.
+
+Learn more from the following links:
+
+- [What Is Mercurious? - GraphQL Server](https://www.youtube.com/watch?v=9nd11l7KpFI)
+- [Documentations of Mercurius](https://mercurius.dev/#/)

src/roadmaps/graphql/content/109-backend-implementations/index.md

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-# Backend implementations
+# Backend Implementations
+
+There are several ways to implement a GraphQL backend, depending on the use case, the technology stack, and the complexity of the application. The most common ways to implement a GraphQL backend are:
+
+- Building a custom GraphQL server
+- Using a GraphQL backend-as-a-service
+- Wrapping a REST API with a GraphQL layer
+- Using a microservices architecture
+
+Learn more from the following links:
+
+- [How to use GraphQL to build Backend-For-Frontends](https://blog.bitsrc.io/how-to-use-graphql-to-build-backend-for-frontends-bffs-4b7e5a0105d0)
+- [Creating A GraphQL Backend](https://www.youtube.com/watch?v=6duKEokTZ44)