what is a day streak?
there are some people that are on day streak 0 but they are on level 10 or something. I have been doing doulingo for 5 days but it says i'm on day streak 1.
A "streak" is an uninterrupted succession of active days on Duolingo. So if you do five days and then have a day without Duolingo activity, your streak will be "zero" again.
So people who have reached high levels in their languages, but have short streaks just had a few days off in their time of participation.
You can go to the lingot store to buy perks, like ones that can keep you're streak for a day when you're inactive. You get lingots by doing things like completing a lesson. I'm probably going over stuff that you already know at this point so...hope this helped in some capacity