For Mr X, here it is in simple terms. Basically, quran is divided in chapters (surahs), and every chapter consists of sentences, each sentence is called a verse (ayat). So if a chapter has 50 sentences, that means it has 50 verses.
If someone says: check verse 34:3, they mean look at chapter # 34, verse # 3.
Quran is supposed to be the literal word of god, and then the 2nd thing is the hadiths, which are simply sayings of prophet that are recorded down. While quran is considered by muslims to be literally true and unquestionable, they can claim that some hadiths are mistaken or not true, etc, since they were written down by humans. (Quran was written down by humans too, but oh well)