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+## Introduction
+The world of artificial intelligence (AI) is evolving day by day, and LangChain is attracting a lot of attention. LangChain is a framework for streamlining application development using large-scale language models (LLMs). This article will explain LangChain in detail through 15 chapters, from the basics to applications.
+
+We will add a new chapter to the article to explain the installation of LangChain. Below is a proposal for a new chapter that fits the existing article structure:
+
+
+## Introduction 2. Installing and configuring LangChain
+To use LangChain, you must first properly install it and configure the environment. Below we will explain the installation steps and basic environment settings.
+
+LangChain can be easily installed using pip, a Python package manager, by running the following command:
+```
+pip install langchain
+```
+If you use the OpenAI API, please also install the following packages:
+```
+pip install openai
+```
+
+Setting environment variables
+When using LangChain, especially when using external APIs, you need to set the appropriate environment variables. For example, to set your OpenAI API key: