Hizb 3 is the first of the two ahzab making up Juz 2, and it carries one of the heaviest concentrations of communal legislation anywhere in the thirty juz, covering fasting, marital conduct and the pilgrimage rites within a single hizb's length. In a nightly tarawih schedule this is typically the second night's opening portion, and its own four rub al-hizb quarters, marked in a printed Mushaf's margin, give a reciter or reviewer a way to gauge pace through material considerably denser than the narrative stretches found elsewhere in the thirty parts.
The juz medallion marking where Juz 1 ended and Juz 2 begins sits at this hizb's own start, one of the plainer cases in the whole Quran where a juz boundary happens to land near a genuine shift in subject, from Abrahamic history into legal instruction, though the coincidence is not the rule: elsewhere a juz or hizb mark falls in the middle of a single sustained argument with no thematic seam at all.
Reviewers pacing memorisation by the sixty-part scheme rather than by surah find hizb boundaries especially useful across a passage like this one, since Al-Baqara's legal material has no chapter breaks of its own to mark progress by, and the rub al-hizb quarters subdivide even this single hizb into four roughly even review sessions.