Never heard なにの. In general, when you combine NANI with a particle like NO or with DESU, you say/read it as NAN. If after NANI there`s the particles WA, GA, MO or WO you read as NANI. If after NANI there`s the particle NO or DESU or a counter like JI or SAI, you combine them and read as NAN. Ex: 何の先生ですか。(Nanno sensei desuka) - What professor?/ What kind of professor? これはなんですか。(Kore wa nandesuka) - What`s this? 何を料理していますか。(Nani wo ryourishiteimasuka) - What are you cooking? 君は何さいですか。(Kimi wa nansai desuka) - What's you age? Back to your question... NANNO and DONO both can mean "what's this/that" or "what kind/sort is". And about your sentence, it's sounds more natural to me to read as NANNO, but that because I'm more used to it, but nothing wrong with DONO too.

I think you can say: 最新のスカルホンギのブランド。(Saishin no sukaruhong no burando) 最新 (さいしん) means something up to date, the latest model, the newest.

I think you wanted to say どんな and not どうな. どんな in general means "what kind of". 1. きみはどんなえいががすきですか。(kimi wa donna eiga ga suki desu ka) >What kind of movie do you like? 2. あのおんなはどんなひとですか。(Ano onna wa donna hito desu ka) > What kind of person is the woman over there? どう means "how about", "how are". 1. いまてんきはどうですか。(ima tenki wa dou desu ka) > How is the weather now? 2. ひさしぶりね、あなたはどうですか。(hisashiburi ne, anata wa dou desu ka) > It has been a long time, isn't? How are you? 3. これはどうですか。(kore wa dou desu ka) > How about this one?

Yes.. And you could also just say うち (uchi). It has the same meaning and it is the shortest way to say "my house". ex わたしのいえにかえる。(watashi no ie ni kaeru) - I will go back home. うちにかえる。(uchi ni kaeru) - I will go back home.

Your sentences are all right and all polite. You could also use the contracted form of ですから that is だから in your first sentence, if you want to sound just a bit less formal. **>> ｢だ｣ is the contracted form of 「です」 and it is generally informal. In your third sentence, you could use が instead of は if you want to give more emphasis to the subject, but that is optional.

The best way to tell the difference between them is to remember that 簡単 also means simple, like a simple question, a simple word, a simple taks, etc. 易しい is more common when you want to say that something is easy to understand or when something was hard, but now is easy to comprehend. Well, that was how I Iearned.

In general, you read 何 as "nani" when it is placed before a particle and "nan" when combined with です or a counter like じ or さい for example. 1 - これは何ですか。(kore wa nan desu ka) - What is this? 2- 何はこれ。(nani WA kore)- What is this? The meaning is the same, but the reading is different. In other cases.. お前は何をしているの。(omae wa nani WO shiteiru no) - What are you doing? [informal] 君の弟はなんさいですか。- (kimi no otouto wa nansai desu ka) -How old is your younger brother? In your sentence.. ここに何がありますか。- (koko ni nani GA arimasuka) Ga is a particle and 何 is coming before it, so you read as NANI.