LangChain and Generative AI: Build Practical LLM Applications — PickAClass
★ 4.0 (2) ⏱ 3h 10m 📚 28 lessons 🎧 Audio version

LangChain and Generative AI: Build Practical LLM Applications

Learn to develop smart language-model applications using LangChain, OpenAI, and Hugging Face by reading clear explanations and practicing with real-world code examples.

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About this course

Generative artificial intelligence is transforming how we interact with technology, but building reliable applications with large language models requires structured coordination. LangChain provides the essential framework to connect these powerful models to your own data and workflows. This course guides you through the process of building intelligent, context-aware applications using Python and LangChain. You will transition from understanding core artificial intelligence concepts to implementing practical solutions like custom chatbots, data analysis tools, and search assistants. What you'll learn: - Understand the foundational concepts of Large Language Models (LLMs), prompt engineering, and the LangChain ecosystem. - Build interactive conversational agents and chatbots that maintain memory and context across interactions. - Implement Retrieval-Augmented Generation (RAG) to connect LLMs to external data sources and document stores. - Configure vector databases and embeddings to perform efficient semantic search and information retrieval. - Develop structured data analysis tools that can query CSV files and databases using natural language. - Create automated workflows using LangChain chains and agents to solve multi-step reasoning tasks. You will start with key terminology and basic setup before moving step-by-step through written explanations and code walkthroughs for diverse application patterns. Each concept is reinforced with practical text-based exercises designed to build your coding confidence. This course is designed for beginners, software developers, and tech enthusiasts who want to enter the world of AI engineering. No prior experience with generative AI or machine learning is required, though a basic familiarity with Python is helpful. Start reading today to begin building your own intelligent language applications.

Course contents

6 modules · 28 lessons · 3h 10m

1 Introduction to Generative AI and LangChain
Understand the core concepts of LLMs and the LangChain framework.
5 lessons · 34 min
  1. What are Large Language Models?
    Explain how LLMs work and their role in modern AI.
    6 min
  2. The Art of Prompt Engineering
    Learn how to craft effective prompts to get better results from LLMs.
    7 min
  3. The LangChain Ecosystem
    Overview of LangChain components and why we use them.
    6 min
  4. Setting Up Your Environment
    Install Python, LangChain, and configure API keys.
    7 min
  5. Your First Chain
    Build a simple LLMChain to link a prompt template with a model.
    8 min
2 Building Conversational Chatbots
Create interactive agents that remember previous parts of a conversation.
5 lessons · 34 min
  1. Why Memory Matters
    Understand the stateless nature of LLMs and the need for memory.
    6 min
  2. ConversationBufferMemory
    Implement basic history tracking for simple dialogues.
    7 min
  3. ConversationSummaryMemory
    Learn how to summarize long conversations to save context window space.
    7 min
  4. Building a Context-Aware Chatbot
    Assemble a chatbot that uses memory to answer follow-up questions.
    8 min
  5. Managing Chat History
    Techniques for storing and retrieving conversation logs.
    6 min
3 RAG: Connecting LLMs to Your Data
Implement Retrieval-Augmented Generation to use external documents.
6 lessons · 40 min
  1. Introduction to RAG
    Understand the workflow of retrieving data before generating answers.
    6 min
  2. Understanding Embeddings
    Learn how text is converted into numerical vectors for comparison.
    6 min
  3. Document Loaders
    Import data from PDFs, text files, and web pages.
    7 min
  4. Text Splitters and Chunking
    Break large documents into manageable pieces for the LLM.
    6 min
  5. Vector Databases (ChromaDB)
    Store and index embeddings for efficient retrieval.
    8 min
  6. Semantic Search & Retrieval
    Query the vector store to find relevant context for a question.
    7 min
4 Structured Data Analysis
Query CSV files and SQL databases using natural language.
5 lessons · 35 min
  1. Chatting with CSV Files
    Use LangChain to analyze and visualize data from spreadsheets.
    8 min
  2. Natural Language to SQL
    Build a bridge between human questions and database queries.
    8 min
  3. Data Analysis Agents
    Automate data exploration tasks using specialized agents.
    7 min
  4. Handling Structured Output
    Force the LLM to return data in JSON or specific formats.
    6 min
  5. Security and Data Privacy
    Best practices for safely querying databases with AI.
    6 min
5 Advanced Workflows and Agents
Create autonomous agents for multi-step reasoning tasks.
5 lessons · 35 min
  1. Sequential Chains
    Link multiple chains where the output of one is the input of the next.
    7 min
  2. Introduction to LangChain Agents
    How agents use tools to decide on actions dynamically.
    7 min
  3. Tools and Toolkits
    Equip your agent with search engines, calculators, and custom functions.
    7 min
  4. Solving Multi-step Reasoning Tasks
    Build an agent that can research and summarize complex topics.
    8 min
  5. Debugging Agent Execution
    Use LangSmith or verbose mode to see how agents 'think'.
    6 min
6 Course Conclusion
Final project overview and future learning paths.
2 lessons · 12 min
  1. Final Project: The Intelligent Assistant
    Guidelines for building a comprehensive application.
    8 min
  2. The Future of AI Engineering
    Where to go after this course to stay updated.
    4 min
Final project

The Universal Personal Assistant

Build a comprehensive AI application that combines a conversational interface with a RAG system (using a provided PDF) and a data analysis tool (using a CSV file).

What you'll get

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  • 📱 Phone or computer
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  • ⚡ Short & focused
    3h 10m of practical content

Certificate of completion

Every course you complete on PickAClass issues a credential like this — original, with its own code, verifiable by URL, and detailed about what was actually demonstrated.

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LangChain and Generative AI: Build Practical LLM Applications
Skills demonstrated
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1.2 hrs
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Performance detail
Coursework summary
Lessons completed 14 / 14
Practice questions 26 / 28
Assignments submitted 4 (avg 4.5 / 5)
Capstone project Reviewed — 4.6 / 5
Total practice 6.2 hrs
Performance benchmark
Cohort rank Top 12% of 1,625
Time to completion 11 days (median: 22)
Mastery score 91 / 100
Practice-question score 94%
Skill verification Verified Skill Path
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Issued under the academic standards of PickAClass. Skill levels reflect assessed performance against the course's competency rubric. This is an original credential of this platform.

Reviews (2)

오채원 KR Verified learner
★ 4 · August 14, 2026

Found it useful. The flow was logical, and the illustrative examples helped solidify the ideas. Could have used a bit more depth.

Henry Moore US Verified learner
★ 4 · August 11, 2026

Good introduction to the topic. The structure was logical, and most of the examples were relevant, though I wished for more depth in certain areas.

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