"The brain is for having ideas, not for storing them." But where do you store these ideas? I'm sure we all know and understand the difficulty of memorizing information (Of course, if you're in an academic setting and have to memorize these, you won't have a choice either). But is that really necessary? This is where the concept of a second brain comes in. While your own physical brain is for having ideas, this "second brain" is for storing them systematically. You can not only store ideas but also slowly build them up, add additional information and create links between ideas in this second brain. While you can have a paper-based second brain, updating it can be tedious, complicated, and sometimes even impossible. While the original Zettelkasten(we will get to what that is later) WAS actually paper-based, most people nowadays, myself included, prefer an online second brain, where you can store, update and find information quickly. One of the most famous...