This is a bit like the idea of "a mind like water" from the GTD philosophy, where capturing ideas elsewhere frees your mind up to make associations creatively and intuitively rather than getting bulge down in ought to remember things.
A second brain is a system for capturing and storing ideas so that you can refer to them later.
It provides a clear, actionable path to creating a “second brain” – an external, centralized, digital repository for the things you learn and the resources.
We are already doing most of the work required to consume this content. We spend a significant portion of our careers creating snippets of text, outlines, photos, videos, sketches, diagrams, webpages, notes, or documents.
7 Principles of Building a Second Brain
1. Think like a guardian
keep track of every good idea, you'll eventually be able to connect a few of them to come up with a new implementation.
unless we make conscious, strategic decisions about what we consume, we’ll always be at the mercy of what others want us to see.
2. Build Good Habit
Develop the habit of keeping track of things that resonate with you. Come up with systems for every situation you find yourself having ideas.
3. Idea Recycling
Keeping track of everything you create means you'll be able to reuse them later.
Every blog post/video/podcast you create should be in your Second Brain.
Then, when you have new projects about a certain topic, you can just take existing things you've created and reuse them rather than starting from a blank page.
4. Enhanced creativity and thought
The act of summarizing a lengthy report or trying to solve a hard problem requires a process of consolidation, description, and communication before you be impactful in your actions. Note-taking can be a great tool to help you with this.
5. Slow Burns
Slowly collecting ideas over time and then tying them together is easier than starting from nothing.
6. Create smaller, reusable units of work
Instead of trying to sit down and move the entire project forward all at once, which is like trying to roll a giant boulder uphill, a more effective approach is to end each work session whether it is 15 minutes or 3 hours by completing just one intermediate packet.
This allows you to work in smaller increments, making use of any available period, while getting lots of feedback and taking frequent breaks.
7. Share your work
By consistently sharing your work with others – whether that is your family, friends, colleagues, or externally on social media – all sorts of benefits will start to materialize. You’ll connect with new collaborators who you never would have imagined would find your work compelling. You’ll find clients or customers, in some cases even when you weren’t seeking them.
Your brain is a dumbass, and your future self is a dumbass. Don't just write down a term and think "I'm sure I'll remember this and know what I was thinking later". You won't. So do yourself a favor and spend some time to flesh it out and spell things out for your stupid future self.