Thanks for explanation :) And question was about where is the yellow car))

Sav already corrected everything which was important, however I'd like to mention that "Hol van sárga autó?" is a question asking where can you find any yellow car. It doesn't matter who owns it or out of 1001 yellow cars which one is it, it just has to be yellow. I could point at three parking cars as an answer, yet technically I did give you a correct answer by doing so. If the question wanted to be something like "Where's the yellow car?", the one you were talking about with a friend earlier for example, the sentence would change to "Hol van a sárga autó?" (a/az is the equivalent of "the" in the language). You're doing a great job btw. :)