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I discovered @neuracache recently, which is an app for improving your memory through spaced repetition, and I think it’s a game-changer for learning. Here’s a 
on why 
on why
First off, what is spaced repetition? Well, it's a learning method that uses increasing intervals of time (based on a "forgetting curve") between study/review sessions to improve recall. (Source: @neuracache)
A forgetting curve, shown in this graph from Wired, is the rate at which learned information drops off without review. The markers are review sessions spaced along a schedule, and show the improvement of recall over time. ( https://www.wired.com/2008/04/ff-wozniak/ paywall $)
(As a side-note, this image shows why cramming doesn't work for long-term recall of information) 
You may, in fact, already be using spaced repetition and just not know it, as some popular apps lean on it to teach specific topics more effectively.
Memrise, for example, uses spaced repetition to learn and remember new languages: https://www.memrise.com/
And @garybernhardt's @exec_prog uses spaced repetition to more effectively learn programming tools and languages like TypeScript, Regex, and SQL: https://www.executeprogram.com/
The difference with NeuraCache, is that isn’t bound to a specific subject or topic, so it represents an incredibly flexible choice for all other learning opportunities.
While NeuraCache joins a long line of spaced repetition software (the most popular of which is Anki) its best features are how well it integrates with modern note-taking tools, and how pleasant the mobile app is to use. These, it turns out, are absolute gold.
To explain why, it's worth considering what came before it. I've toyed with Anki and paper flashcards in the past, but always felt that the study material ends up being divorced from the original content and context. With NeuraCache, that isn't the case.
You take notes on what you read, and choose some of those notes to become questions. NeuraCache then processes your knowledge graph and builds up decks of digital flashcards *directly* from your study material. (Source: @neuracache)
In this way, your primary sources and your study material are intimately bound, both reducing the work required to develop flashcards, and keeping them in sync with the context of the original material.
Pairing this easier and contextual creation with a quality app is incredible, as you spend less time fighting or managing a system, and more time on recall. And even that doesn't take that long.
@andy_matuschak and @michael_nielsen suggest in their latest essay Timeful Texts, that "...expanding intervals allow readers to maintain a collection of thousands of prompts while reviewing only a few dozen each day." https://numinous.productions/timeful/
This makes it far easier to integrate with your daily life, as you can use those brief moments, like waiting in a queue, or for the kettle to boil, to review and improve your recall of topics you care about.
