I've been using Uberchord for a few years by now and it's just amazing. It's all about chords, rhythm and songs. This is no child's game, though, you actually learn how to play. The recognition works for most of my guitars and is borderline crazy, even showing me if I put a finger on the wrong fret. It won't let you just play anything and still pass. They have courses library (they call it learning path) and a pretty large catalog of popular songs. I wish they had solo training, but all in all, highly recommended.
Based on our record, Weava seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
It might help to use a highlighting app, something like Weava (weavatools.com) which will store and collect your highlights off to the side of the text so you don't have to keep flipping through pages. Source: about 1 year ago
For classes with a lot of readings, use an annotation thing like Weava (weavatools.com) or Zotero that keeps all your highlights in one place and searchable. Source: over 1 year ago
Fretello - Duolingo for learning how to play guitar
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Diigo - Diigo is a powerful research tool and a knowledge-sharing community