What's the best app to keep track of self directed learning?

I use trello to organize my learning. I was curious what other options are out there to help keep all the learning organized.
Josh BirdwellSoftware Developer Intern, NextThought · Asked
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Dropbox Paper

Collaboration tool built for teams

Aminadav GlickshteinEntrepreneur & Full-stack developer · Written
It let you focus on content. It easy to use WYSIWYG editor for MarkDown. You can add everything you learn, and do not waste time on design.
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