From the photo it looks like a variegated groundcover weed that often escapes into cracks by foundations. The leaves are opposite on a slender stem and some leaves show yellow/cream variegation, which is typical of Lamium galeobdolon (yellow archangel) or a similar variegated vinca. It’s a common shade-tolerant plant that can spread aggressively.

How to care for it (general guidance):

• Light: Prefers shade to light, filtered sun. Avoid hot direct afternoon sun.
• Soil: Moist, well‑drained soil. It tolerates poorer soils but prefers moisture.
• Water: Keep evenly moist while establishing; once established, it’s relatively drought-tolerant but will look best with regular moisture.
• Maintenance: It tends to spread. If you don’t want it to take over, trim back runners and periodically dig up and divide to control its spread. Wear gloves when handling, as some varieties can be mildly irritating.
• Propagation: By division or cuttings.
• Pests/diseases: Generally pest-resistant; watch for powdery mildew in very humid conditions.

If you’d like a more precise ID, a close-up of the leaf margins and the stem (saw-tooth or smooth margin? scent when crushed? square stem?) or a photo of the plant in bloom would help.