Do you write down what you learn?
Do you write down what you learn on Duolingo?
Don't forget that to get to levels below 10 does not take too much effort and does not mean you've achieved much. People with large strings of languages are usually those who have had a quick go at a lot simply out of interest. That's what I will do when I have the time.
Having said that, even having just three at 10 or more is pretty impressive.
I have a binder for each language. I write down the vocabulary and their meanings and below that, I write down all the sentences with their translation. I can go back and restudy especially difficult word conjugations to make them easier to remember how to conjugate the verbs. Since you have to do an entire lesson again to find the one you may have trouble with.
It helps with memory.
I write down the Tips & Notes for French because Duolingo is currently the only resource I use for this language. (Just making myself familiar with the language right now.) For the other languages I am studying own books to use instead or I use certain websites for grammar.
I took a lot of notes when I did Japanese lessons on youtube but since it's easy to repeat things here at Duo I haven't taken any notes. I know I should as that helps with the learning process but I'm basically just familiarizing myself with the language for fun. I want to be fluent but I'm happy with whatever that sticks ;)
Funnily enough I asked this question a week or so ago.
But yeah, I do. One of my tactics for language learning is quite uncommon - I keep a notebook of vocab and open it up on my desk, Sometimes I'll look at it when I'm on my computer and then I'll be reminded by the vocab. It's unusual but works so why the hell not? xD
Not necessarily what I learn on DL, but I do, from time to time, practice a bit by writing down stuff. Mostly paradigms, for example verbs or German cases.
I also kept a journal of my stay in Italy, although I typed it out in Word instead of writing on paper. Typing has the advantage of correcting without making a mess of it all, but I do think that writing down is more effective, as you're combining brain memory with muscle memory. Well, typing has that advantage too, but hitting keys in a particular order is not as effective as guiding your pen to form the individual letters.