Evernote is another free tool that I use extensively every single day. While Evernote is free (in the basic versions), I do recommend purchasing the basic version of Evernote Essentials. I paid full price for this guide to Evernote and it was totally worth every penny.
An Introduction to Evernote
Evernote is a note-taking service that is SO. MUCH. MORE. When you open an account, you start with just a blank slate and the ability to write notes and create notebooks (notes in notebooks and notebooks in notebook stacks is the filing system of Evernote). It’s basic. It’s easy. Maybe TOO basic and easy. This is where Evernote Essentials comes in. Brett Kelly tells you all the ins and outs and cool things you can do and how to get started so you don’t regret your notebook structure later. (Evernote actually hired him to work for them after his first version of the book!) Evernote allows you to write notes, lock notes, make checklists, clip websites directly, link with Google Drive, and a whole bunch of other cool stuff!