@AnikaBrodie wrote:
Yesterday I bought a Maranta plant (also known as Red Prayer) at the nursery. Today I replanted it and watered it. Now I am wondering when to water and how much to water. Any advice? My plant looks similar to the one below. I have it near a west window in the sunroom.

@AnikaBrodie Google has more detailed care guide.
To care for a Maranta (Prayer Plant), provide bright, indirect light, maintain consistently moist (but not soggy) soil, ensure high humidity, and keep temperatures between 60°F and 80°F (16°C and 27°C).