After trying some other Dutch classes, I felt I had to return to DuoLingo and refresh my vocabulary and return each topic to gold, the colour of completion. Duolingo are correct, when they say that learning a language requires practice every day. Revisiting these lessons illustrates the vagaries of memory. For example I could remember such daunting words as “bezienswaardigheden” – places of interest or sights to be seen but not remember that “alleen” means only.
I can certainly recommend Duolingo to get you started in a language, it won’t get you anywhere near fluency but it will provide you with an excellent base on which to increase and develop your knowledge.