How can I effectively use fertilizer to improve the quality of my soil?

To effectively use fertilizer to improve soil quality, you should first test your soil to determine its nutrient needs. Then, choose a fertilizer with the right balance of nutrients for your specific soil deficiencies. Apply the fertilizer according to the instructions on the package, taking care not to over-fertilize, which can harm plants and the environment. Regularly monitor your soil's nutrient levels and adjust your fertilization schedule as needed.