I was rather harsh on Duolingo about half a year ago about their platform and learning process. I recant on this as I have really been finding some great utility in their platform, all of which easily drowns out the minor annoyances that crop up.
Taken from Episode #287 of 'Meanderings'.
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▶️ 3Speak
Duolingo is an excellent tool and can be a fantastic complement to other learning methods. If you are learning French, for instance, the https://promova.com/alphabet/french-alphabet site offers different sorts of resources, from pronunciation guides to understanding of diacritical marks, that can deepen your language journey in a way Duolingo alone may not.