Pentacles map to earth. Earth is slow, heavy, load-bearing, and needs time — so Pentacles are about body, money, material, craft, and every result that only appears through accumulation. It's the one suit that pictures a thing rather than a tool, and that's honest: it's about the layer you can see and touch.
Where you'll recognise it: the number in the account, the state of your body, how long you've practised a skill, whether a thing has actually been made. Ace to ten walks the material road — opportunity, juggling, apprenticeship, hoarding, want, giving and receiving, waiting for harvest, refining, independence, inheritance.
Running well, Pentacles are your most dependable part: you deliver, you keep, you're patient. Stuck, earth's problem is weight — gripping, fearing change, staking all your security on things; or the reverse, ignoring the body and the bills entirely. So when Pentacles appear, look first at time. Earth needs seasons; how many steps to harvest is closer to the card's point than whether the money will come.