My favourite German online dictionary is:
This is a good dictionay because it shows
1) How much a word is used
4) Declination (ex. Plural)
5) Verbs/Adjectives/Nouns used with this word
I am using this dictionary a lot at work, especially when I have doubts about the gener of one word, the plural or which verb should I use with word.
Am mostly on dict.cc
Duden is often referred as a standard for German language. However it is a single language dictionary which can be diffiult to understand for a beginner.
Thank you so very much. It looks really useful, Happy New Year