The one card spread is exactly what it sounds like, and it is the layout most readers come back to after a few years of increasingly elaborate ones.
What the single card is for
A nudge, a mood, a second opinion on something you already half know. It takes about ninety seconds and it fits in the gap between the kettle and the first meeting.
It works best on open questions. What am I not seeing here. What would actually help today. What is this restlessness about. Give a single card an open question and it has room to say something; give it a closed one and you will spend ten minutes bending the picture into a yes.
How to ask
Write the question first, in one sentence, before you draw. This is the part everyone skips and it is the part that makes the difference, because a question written down cannot quietly change into a different question once the card is showing.
Then read the card for that question rather than reciting its meaning. The picture is doing something. Ask what it is doing about the thing you asked.
When to use something bigger
If there are two options, use three cards. If it is a relationship you have been going round in circles about, the love spread is built for it. If you have half an hour and a situation with layers, the Celtic Cross exists for that and for very little else.
When the card makes no sense
It happens, and the usual cause is that the question was not the real one. A card that seems to be answering something else is often answering the thing underneath, which is worth sitting with for a minute before you decide the draw was a dud.
The second cause is a card you do not know well. If the picture means nothing to you, go and read its page properly rather than guessing from the name. Half of what people call an unclear reading is an unfamiliar card.
Start a one card reading
Open the one card spread, ask your question in your own words, and see what turns up.
One card is not a small reading. It is a short one, which is a different thing entirely.
Questions people ask
Is one card enough for a real question?
For a great many questions it is more than enough. A single card gives you one clear idea to hold, and one clear idea acted on beats five threads you cannot quite hold together.
What kind of questions suit one card?
Open ones. What am I missing here, what would help today, what is this feeling about. Closed questions with two options tend to need the three card layout.
Can I pull a clarifier?
Once, if the first card genuinely made no sense with the question. Twice is usually shopping, and by the fourth card the reading has become a negotiation with yourself.