How can I effectively use well-rotted manure in my garden to improve soil fertility and promote healthy plant growth?

To effectively use well-rotted manure in your garden, spread a layer of it over the soil and mix it in thoroughly. This will improve soil fertility by adding nutrients and organic matter. The manure will also help retain moisture and improve soil structure, promoting healthy plant growth. Make sure the manure is well-rotted to avoid burning your plants with excess nitrogen.