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
Marcus VlahovicFounder & CEO, Sustainabody · Written
Pretty great for keeping track of time between subjects - perfect for self directed learning as time management is where you're most likely to slip up (or at least where I would slip up)!
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