So technically speaking the two sentences do not mean the same thing since the second one is saying you're putting up a poster that belongs to your favorite singer. Whereas the first one says you're putting up a poster of your favorite singer.

Dear Michael. I'm glad it is helpful. But what I've done isn't worth the 1/100 of what you've done for me. Again, thank you so much for your time and effort from the bottom of my heart.

Thanks, liveoutmyway. It is helpful. I know I should work on being clearer in my writing. Sometimes it takes longer to find a way to express complex ideas clearly and simply, but I'm sure it is always worth the extra time. There is a famous old quote in English, I think translated from French originally, that goes : "I'm sorry I wrote you such a long letter; I didn't have time to write a short one." https://en.wikipedia.org/wiki/Blaise_Pascal

Now, I don't know whether I really need a printed dictionary either. As an English learner who is trying to become the advanced level. I have to say the words and usages in your writing is advanced level and some of them is a challenge for me to understand. But overall, it is a good material to learn from. And because, by using a computer, I have the software (application) that helps me to translate instantly. Thank to the apps which can help to turn the difficult job into a acceptable one. From my experience, Instead of printed dictionary, I prefer to use the online dictionary or search answers online by using computer with the instant translator, in case there are something need to be translated instantly. And not only the translators is useful but also I can use computer to save and organize all the related English problems, grammars in a document by just copying and pasting, and most importantly I can find back what I want or half-remembered things by searching the well-organized documents directly. I think that is why, as a English learner, I think it is more convenient for me to use computer and online sources to learn English. Hope it will be helpful for you. Best wishes to you, too.

Dear Michael Thank you so much for your time and effort. What you said is really helpful. --- Especially, 1. "A book of Michael's.= Michael's book " 2.That is a book of Michael => it contains Michael's writings. exception : He's a friend of Michael. (completely acceptable) --- Thanky you for eliminating the flawed sources. It actually help me correct and slove the confusing questions. I will redirect and focus more on the authoritative source like Cambridge dictionary. I will also try and challenge wordreference.com as you suggest.