I am learning a great deal with my Swedish lessons at Duo Lingo.
The Color section is the first section I had have problems with. The Discussions with other learners help with my problems, but they are not a good substitute for having a Tips and Notes section when introducing a new topic as all of the other sections do. Specifically, there should be notes for the endings taken by adjectives---colors in this case---and there should also be an explanation for the use of the word "de" because this word is used in a way that is completely new for me.
Again, I appreciate the efforts of everyone here who is helping. My comment is made in the spirit of pointing out places where a complete beginner may stumble seriously.
Well, it is similar to the possessive adjectives which we previously learned. Scroll down at this page with a browser for those tips and notes. https://www.duolingo.com/skill/sv/Possessives
Here is a list of colors: https://www.duolingo.com/comment/6072830 and the adjective tips and notes come later.