The Celtic Cross is the best-known full tarot spread. Ten cards cover a situation from every side: what is happening now, what crosses it, what lies behind it, what comes next, what you are aiming for, what sits beneath the surface, how you see yourself, how others and circumstances affect you, what you hope for or fear, and the likely outcome.
Because it takes ten cards, the Celtic Cross suits a bigger question or a period of change rather than a quick daily check. Take your time with each position and notice which cards repeat a theme.