What language level will i be after mastering everything the ukranian course on duolingo has to offer, or what it has. thanks
Not too high. It's one of the shortest trees on Duolingo and for a langauge without all that much obvious cognate vocabulary. I don't think the tree even covers all the grammatical cases, which of course are necessary to speak correctly.
I'm at level 9 after completing the tree, but I don't repeat the lessons. I took the course as a curiosity as I already know Ukrainian.
"tree" just refers to a Duolingo language course; I think the terminology largely dates to a time when the skill nodes were connected by lines, eliciting a resemblance to "trees" from graph theory
Just look at the top couple comments in the thread I linked to :)
The "list" of French lessons is the French tree. What's shown in the link is a previous design.