Sure! I think Duolingo is fantastic to learn basic sentences and vocabulary. To reach A1/A2 proficiency, Duolingo is absolutely amazing in my opinion (I can only judge it for French though).
For me personally, YouTube has been an amazing learning source for French - there are a lot of channels out there with tons of high quality teaching videos. If I had to name one, "Learn French with Alexa" is probably my favorite, but for a lot of topics it's very useful to watch multiple videos from different channels on the same topic, both as repetition and also because sometimes having multiple, slightly different explanations helps.
Since a few months, I do visit a weekly French course though - self study brought me only so far; reading already works quite well, listening so-so (depends on the talking speed), but I have a hard time speaking myself. It takes a very long to find the words, but the more I have to talk in course the better it goes.
One more thing: For purely learning vocabulary, I very much recommend Anki, it's amazing to just memorize words.
Ugh, this got a bit longer than intended, hope it gave you a bit of an overview of my approach :)
Once you go into the B1+ area, the usefulness of Duolingo starts to fall off, slow but steady - learning grammar and conjugations in all the different tenses isn't its forté. I think it's still very useful for repetition and constant exposure to the language, but without content outside of Duolingo, I'm not quite sure if it would work out so well.
For me personally, YouTube has been an amazing learning source for French - there are a lot of channels out there with tons of high quality teaching videos. If I had to name one, "Learn French with Alexa" is probably my favorite, but for a lot of topics it's very useful to watch multiple videos from different channels on the same topic, both as repetition and also because sometimes having multiple, slightly different explanations helps.
Since a few months, I do visit a weekly French course though - self study brought me only so far; reading already works quite well, listening so-so (depends on the talking speed), but I have a hard time speaking myself. It takes a very long to find the words, but the more I have to talk in course the better it goes.
One more thing: For purely learning vocabulary, I very much recommend Anki, it's amazing to just memorize words.
Ugh, this got a bit longer than intended, hope it gave you a bit of an overview of my approach :)