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
1
Evernote

Note taking gets even simpler

Adil MajidProduct Designer · Written
It's great to use as an info dump. I use it to storing my notes, articles/PDFs I want to read on a topic. It's easy to organize and infinitely flexible. Not the best tool for reminders and scheduling tasks, though, although it does have a feature for reminding you to review a particular note at a later date.
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