The Page of Cups, and the offer you did not ask for
Suit of cups2 min read

A fish in a cup, a courtly pose, and why this page tends to describe a first attempt rather than a result.
A young figure in a blue tunic printed with flowers holds up a golden cup, and a fish is looking out of it. Behind them, a flat sea with a small wave. The Page of Cups is the least dignified image in the court cards and deliberately so. Something has appeared in the cup, the figure did not put it there, and they are holding it out rather than hiding it.
Upright, it tends to cover beginnings in the emotional and creative area: a feeling that arrives unasked, an offer made tentatively, a first attempt at something you are not good at yet. Court cards read better as a stance than an event, and this stance is openness without much skill attached. The page is not embarrassed about the fish. That is the whole quality of the card.
In readings about other people it often points at someone being sincere and slightly awkward about it, or at a message that has not been sent yet. In readings about work it tends to describe the sketch rather than the finished thing, which can be reassuring in a spread where you were worrying that your idea is unpolished. Beside the Three of Pentacles, a card about craft and collaboration, it often reads as an amateur idea that is about to get real hands on it.
Reversed, three readings are worth testing. Blocked: the idea or the feeling is being kept in, the message drafted and not sent, the creative thing that never leaves the notebook. Inward: something felt privately and deeply that would look small if you described it out loud, which is a real state and not a failing. Dialled down: a passing mood that the rest of the spread does not support, which is the most common one and the easiest to overlook.
The reading to be careful with is the sulky page, the version where reversed means immaturity or emotional manipulation. It exists in the older books and it is harsh in a self-reading. If you are going to use it, use it about behaviour you can name, not as a character judgement about a person you are asking about.
A good habit with all four pages, and this one especially: ask what stage it describes. Pages are not outcomes. If your question was about how something will turn out, a page in the spread is usually telling you that the thing is still at the point where a cup gets held up and a fish looks back, which is earlier than you wanted to hear but useful to know.