https://www.amazon.com/HSK-Standard-Cou ... 7561937091This is the standard Hanban (runs the HSK exams) series and the series I'm familiar with.
The biggest flaws with the series is that it's not usually complete with word lists (there's a substantial inventory missing in HSK 4, 5, and 6) and misses some crucial grammar points (how to diagram a sentence).
https://www.amazon.com/PRACTICAL-CHINES ... 7561921632This is from roughly the same people (BCLU iirc), and covers the grammar more in detail.
I assume you're not a heritage learner, so you'll have more problems with pronunciation and listening. Tones is what usually trips up Chinese learners, but strict pronunciation is also a hassle. The Hanban HSK 1 books are kind enough to include mouth diagrams (shown from the inside) to help with Chinese pronunciation, especially since retroflex initials aren't common in other languages. u umlaut doesn't exist in English, but it does exist in French and German, so not sure how well you might do with that as you're a native Italian. c (ts), z, and s also vary from their English as these are pronounced at the teeth (between English th and s).
Tones is just, practice, practice, practice, use tapes and repeat what they've said and see if you can simulate their tones. Treating it as do re fa so la is another way to handle it, and ironically, my first tone maps to la (I have decent relative pitch and am training absolute pitch).
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Since Chinese will roughly take most learners 4k hours to hit C1 (HSK6), it might be correct to figure out when to put it back on your back burner. HSK1-3 is insufficient for oral speech, and mastering HSK 4 will get you to the oral speech level. At some point, you'll want to switch to learning characters in detail, although this is more useful past HSK 4.
This means you'll have to learn Kangxi and Xinhua radicals.
Kangxi:
https://en.wikipedia.org/wiki/Kangxi_radicalXinhua:
https://en.wikipedia.org/wiki/Table_of_ ... ComponentsThis comes to another flaw of the Hanban system. By treating words as the basis of instruction, you're ignoring characters, which function as morphemes. While character to word mapping is not absolute (偶象, ou1 xiang4 is not random, seldom image, it's idol), the morpheme composition often provides a vital clue and memorization aid to the word itself. I've heard once that for German, you only need 10,000 root words to get through the majority of any written text, and while Chinese isn't going to be that way, knowing characters helps a lot in other ways (knowing how to pronounce unfamiliar words).
A final aid in Chinese characters would be John DeFrancis' "The Chinese Language: Fact and Fantasy" which helps break down a lot of preconceptions.
https://en.wikipedia.org/wiki/The_Chine ... nd_FantasyThe most useful takeaway is that Chinese characters are often phonetic-semantic compounds, i.e, part of the character indicates an approximate sound (sometimes giving you the pronunciation minus tone, often just giving you an initial or final), part of the character indicates the specific meaning.