Qt c++ drawing recursive curves

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C++

guys , can anyone give me any tutorial for Qt , i have an assignment and i dont have much of time to do it .. i'm in deep prblm guys .
i'll be gratefull for any thing , i tried youtube but it wasn't what i want .
i just want to know what should i choose "qwidget ,q dialog or qmainwindow" and whrer should i put the declaration of functions and the definition of them .
where can i find the needed libraries and things like that .
hope i've been clear with my prblm :'(.