CF

Build an LLM-powered Q&A App using LangChain, OpenAI and Python

2h 38m 22s
English
Paid
Updated September 2026

Build an LLM-powered Q&A App using LangChain, OpenAI and Python is a 23-lesson 2 hours 38 minutes self-paced course by Zero To Mastery. Standard LLMs like GPT answer well from what they were trained on, but this project tackles the opposite problem: asking questions about information the model has never seen, such as private documents or anything published after its…

Course facts

Lessons
23
Duration
2 hours 38 minutes
Level
All levels
Language
English
Updated
2026-09-11
Instructor
Zero To Mastery
Price
Premium

Standard LLMs like GPT answer well from what they were trained on, but this project tackles the opposite problem: asking questions about information the model has never seen, such as private documents or anything published after its training cutoff.

What you'll build

Working step by step, line by line, you'll build a Q&A application that feeds books and documents into an LLM pipeline using LangChain, Pinecone, OpenAI and Python, so the model can answer questions grounded in that material.

Why LangChain

LangChain is an open-source framework for combining large language models like GPT-4 with external data and computation, making it easier to build and deploy scalable AI applications. Whether your background is technical or not, it's a practical entry point into building real AI services.

Format

This is a portfolio-style project you can complete in roughly three hours, designed to add a concrete, working AI application to your resume.

Who teaches Build an LLM-powered Q&A App using LangChain, OpenAI and Python? Zero To Mastery

Zero To Mastery thumbnail

Zero To Mastery (ZTM) is a Toronto-based online coding academy founded by Andrei Neagoie, originally a senior developer at large Canadian tech firms before turning to teaching full-time. The academy's signature is the cohort-based bootcamp track combined with a deep self-paced course library, all aimed at career-changers and self-taught developers preparing to land software-engineering roles at top companies.

The instructor roster has grown well beyond Andrei to include other senior practitioners: Daniel Bourke (machine learning), Aleksa Tešić (DevOps), Jacinto Wong, and others. Courses cover the full software-engineering career path: web development with React and Next.js, Python, machine learning and deep learning, DevOps and cloud, system design, mobile, and the algorithm / data-structure interview prep that gates engineering jobs.

The CourseFlix listing under this source carries over 120 ZTM courses spanning that full range. Material is paid; ZTM itself runs on a monthly / annual membership model. The teaching style favours long-form, project-based courses where students build complete portfolio-quality applications rather than disconnected feature tutorials.

What lessons are included in Build an LLM-powered Q&A App using LangChain, OpenAI and Python?

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#1: Project Demo
All Course Lessons (23)
#Lesson TitleDurationAccess
1
Project Demo Demo
05:25
2
Introduction to LangChain
07:16
3
Setting Up The Environment: LangChain, Pinecone, and Python-dotenv
11:02
4
LLM Models (Wrappers): GPT-3
06:14
5
ChatModels: GPT-3.5-Turbo and GPT-4
04:42
6
Prompt Templates
05:11
7
Simple Chains
05:50
8
Sequential Chains
08:08
9
Introduction to LangChain Agents
04:01
10
LangChain Agents in Action
05:29
11
Short Recap of Embeddings
01:53
12
Introduction to Vector Databases
06:58
13
Splitting and Embedding Text Using LangChain
09:20
14
Inserting the Embeddings into a Pinecone Index
07:54
15
Asking Questions (Similarity Search)
07:54
16
Project Introduction
06:09
17
Loading Your Custom (Private) PDF Documents
07:28
18
Loading Different Document Formats
05:13
19
Public and Private Service Loaders
04:38
20
Chunking Strategies and Splitting the Documents
06:39
21
Embedding and Uploading to a Vector Database (Pinecone)
11:18
22
Asking and Getting Answers
10:34
23
Adding Memory (Chat History)
09:06
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Frequently asked questions

What prerequisites are needed before enrolling in this course?
The course is designed for both technical and non-technical audiences, so no specific prerequisites are required. However, familiarity with Python and basic programming concepts will be beneficial since the project involves setting up environments and writing code. Knowledge of AI concepts will also help, but the course provides an introduction to LangChain and related technologies.
What can I expect to build by the end of this course?
By the end of the course, you will have built a Q&A application powered by large language models (LLMs) using LangChain, Pinecone, OpenAI, and Python. The application will be capable of processing extensive information inputs, such as books and documents, to answer questions based on data not included in the LLM's original training set.
How does this course compare in depth and scope to other AI courses?
This course focuses specifically on building a Q&A application using LangChain and OpenAI, emphasizing practical application over theoretical depth. It covers setting up environments, using LLM models, and working with vector databases like Pinecone. Unlike broader AI courses, which may cover a wide range of topics, this course provides a focused, hands-on experience in creating scalable AI applications.
What specific tools and platforms will I learn to use in this course?
The course teaches you to use LangChain, an open-source framework that simplifies working with LLMs. You will also learn to work with Pinecone for vector databases, OpenAI's GPT models, and Python for programming. These tools are integrated to build an LLM-powered Q&A application, providing practical skills in AI application development.
What topics are not covered in this course?
This course does not cover the theoretical foundations of machine learning or deep learning beyond what is necessary to understand LangChain and LLMs. It also does not include topics such as model training from scratch, advanced NLP techniques outside the scope of LangChain, or deployment to specific production environments.
How much time should I expect to commit to this course?
The course is structured to be completed in approximately 3 hours. This includes 23 lessons, which guide you through building the Q&A application step-by-step. Additional time may be required for setting up environments and practicing the skills learned, especially for those less familiar with programming or the specific tools used.
How can the skills learned in this course be applied to a career in AI?
The skills acquired in this course can be valuable in various AI-related roles, such as AI developer, data scientist, or machine learning engineer. Understanding how to build applications using LLMs and frameworks like LangChain can open opportunities in developing AI services and solutions across industries, enhancing your ability to contribute to AI projects and innovation.