Rohini is the fourth, ruled by the Moon, its symbol a loaded ox-cart, its deity Prajāpati the creator (later identified with Brahmā). It's where the Moon is strongest — the Moon's exaltation in Taurus falls in this nakshatra — so the tradition calls Rohini the Moon's favourite wife, a story that is really astronomy: here the Moon is brightest, fullest, most nourishing.
Mechanically, the Moon governs nourishment and feeling, Prajāpati creation and fertility, and the cart is literal load-bearing. Together: growing a thing from seed to form, until the cart is full. This nakshatra's power isn't speed, it's that things actually grow — crops, work, relationships and wealth are all the same capacity.
Where you'll recognise it: a strong feel for beauty and comfort, an ability to grow things to term, patience for ripening, deep investment in what you love, and a tendency to hold it too tightly. Running well, you're the one who can raise anything: a body of work, a team, a bond — slowly, and it really does grow. Stuck, you possess or indulge — unable to release what you raised, too fond of comfort, abundance mistaken for safety. Krittika before it burned; Mrigashira after it starts searching: once full, a person wants to go out and see what else there is.