Let's see if I can understand Neapolitan!

Links to the videos used
https://www.youtube.com/watch?v=gBMwKBm-ITA
https://www.youtube.com/watch?v=xwRfFR19wJc
https://www.youtube.com/watch?v=kJnXwE1dBeQ

Neapolitan (autonym: ('o n)napulitano [(o n)napuliˈtɑːnə]; Italian: napoletano) is a Romance language of the Italo-Romance group spoken Naples. It is named after the Kingdom of Naples, which once covered most of the area, since the city of Naples was its capital. On 14 October 2008, a law by the Region of Campania stated that Neapolitan was to be protected.[2]

Neapolitan, napulitano or napoletano may refer instead to the specific Romance varieties spoken natively in Naples and the immediately surrounding Naples metropolitan area.[3][4]

Distribution
A Neapolitan speaker, recorded in Italy
Largely due to massive Southern Italian migration in the late 19th century and 20th century, there are also a number of Neapolitan speakers in Italian diaspora communities in the United States, Canada, Australia, Brazil, Argentina, Uruguay, Mexico, and Venezuela. However, in the United States, traditional Neapolitan has had considerable contact with English and the Sicilian languages spoken by Sicilian and Calabrian immigrants living alongside Neapolitan-speaking immigrants and so the Neapolitan in the US is now significantly different from the contemporary Neapolitan spoken in Naples. English words are often used in place of Neapolitan words, especially among second-generation speakers. On the other hand, the effect of Standard Italian on Neapolitan in Italy has been similar because of the increasing displacement of Neapolitan by Standard Italian in daily speech.

Classification

Giambattista Basile (1566–1632), author of a collection of fairy tales in Neapolitan that includes the earliest known versions of Rapunzel and Cinderella
Neapolitan is a Romance language and is considered as part of Southern Italo-Romance. There are notable differences among the various dialects, but they are all generally mutually intelligible.

Italian and Neapolitan are of variable mutual comprehensibility, depending on affective and linguistic factors. There are notable grammatical differences, such as Neapolitan having nouns in the neuter form and a unique plural formation, as well as historical phonological developments, which often obscure the cognacy of lexical items.

Its evolution has been similar to that of Italian and other Romance languages from their roots in Vulgar Latin. It may reflect a pre-Latin Oscan substratum, as in the pronunciation of the d sound as an r sound (rhotacism) at the beginning of a word or between two vowels: e.g. doje (feminine) or duje (masculine), meaning "two", is pronounced, and often spelled, as roje/ruje; vedé ("to see") as veré, and often spelled so; also cadé/caré ("to fall") and Madonna/Maronna. Another purported Oscan influence is the historical assimilation of the consonant cluster /nd/ as /nn/, pronounced [nː] (this is generally reflected in spelling more consistently: munno vs Italian mondo "world"; quanno vs Italian quando "when"), along with the development of /mb/ as /mm/~[mː] (tammuro vs Italian tamburo "drum"), also consistently reflected in spelling. Other effects of the Oscan substratum are postulated, but substratum claims are highly controversial. As in many other languages in the Italian Peninsula, Neapolitan has an adstratum greatly influenced by other Romance languages (Catalan, Spanish and Franco-Provençal above all), Germanic languages and Greek (both ancient and modern). The language had never been standardised, and the word for tree has three different spellings: arbero, arvero and àvaro.