If you have ever felt overwhelmed by endless notes, forgotten ideas, and the sheer volume of information you consume daily, you are not alone. Here’s where a popular concept of the second brain comes into play. Among the dozens of such tools out there, I have found NotebookLM to be an invaluable tool in bringing this idea to life.

I went on a mission to centralize my knowledge, streamline my workflow, and ensure no valuable insight slips through the cracks. Let me share exactly how I structured my second brain within NotebookLM and offer a practical blueprint for creating an intelligent knowledge hub.

Why NotebookLM for my second brain?

Let’s address the burning question first

When it came to choosing the right tool for my second brain, NotebookLM quickly rose to the top. One of the biggest reasons I went towards NotebookLM is its versatility in handling sources. My information comes from all over the place – I have got important PDFs from research papers, internal Google Docs for work projects, a bunch of webpages, and even insightful YouTube videos I watch.

The beauty of NotebookLM is that I can feed all of these diverse formats into a single notebook. Of course, a PKM system isn’t complete without manual notes. I can add notes with relevant information and convert it to source with a single click.

I can simply jot down a thought, a reminder, or a personal reflection right within the notebook, and it becomes part of the knowledge base that the AI can then interact with.

And I’m glad to see NotebookLM’s arrival on mobile platforms. For someone like me, who is always on the go, the convenience of a mobile app is a must-have.

Of course, like any tool, there are some downsides to using NotebookLM as a PKM system. For example, there is no graph view, bi-directional linking, tags, and more. However, its AI capabilities make up for these limitations (more on that in a minute).

Structuring a notebook in NotebookLM

An important aspect of any PKM system

Structuring a notebook in NotebookLM is a bit different from how you might approach a workspace in Notion or a vault in Obsidian. In those tools, you are building networks of linked pages and nested folders from the ground up.

With NotebookLM, the core unit of organization is the notebook itself. Let me give you a recent example. I wanted to dive deep into Docker. I created a new notebook called ‘Docker Container Fundamentals and Practical Use’ and started adding sources.

Focused scope is the first rule for me because each notebook should have a clear, singular purpose. For Docker, it was about understanding the technology, best practices, and practical applications. This ensures that when ask NotebookLM a question, its brain is fully tuned to that specific subject matter.

Just like I mentioned earlier, NotebookLM’s ability to support various formats is fantastic. For my Docker notebook, I started by adding a couple of hour-long YouTube video tutorials that gave a great overview. Then, I pulled in a couple of web links from official Docker documentation and popular development blogs.

I even uploaded a few PDF cheat sheets I found. The goal was to give AI as much high-quality and relevant data as possible about Docker.

Integrating my own insights is where I felt like building a second brain. For instance, I had several notes on the best Docker containers for productivity, home lab, and web development.

These weren’t sourced from my uploads; they were my own lists and thoughts. The amazing part is that NotebookLM treats manual notes as equally valid sources of information within that notebook.

The AI capabilities are top-notch

That too for free!

So, while Notion might let me create a Docker page with linked sub-pages and databases, and Obsidian would have a Docker vault with Markdown files and backlinks, NotebookLM has a different kind of power.

Instead of searching for keywords, tags, or notes, I can ask the following questions about Docker.

• Provide a brief overview of Docker Compose.
• How do Docker containers fundamentally transform the software development and lifecycle?
• Which is the best Docker container for cloud storage?
• What are the most common use cases for Docker?
• Explain the concept of Docker images versus containers in simple terms.

Remember, the more specific and focused your questions are, the better and more relevant responses you will get from NotebookLM.

And like a Notion workspace or a OneNote notebook, once your NotebookLM notebook is filled with relevant details, you can share it with team members and others with different permission levels and a welcome note.

Similarly, I have created multiple notebooks for personal thoughts, work projects, Framer, and even travel plans.

The brain upgrade

Building a second brain isn’t just about organizing notes; it’s about creating an interconnected system that elevates your thinking and boosts your productivity. The best part about building a PKM system in NotebookLM is that there is no difference in AI capabilities between the free and Pro plans. So you can get started for free (with Google’s AI plan) and enjoy the same robust capabilities to extract meaningful information.

Now, check out my dedicated post if you are looking for some tips to create a solid PKM system.