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Yes, you can put soil on top of existing grass to level small areas. This is helpful for filling in small divots or leveling out minor dips in your yard that collect rainwater. However, this isn’t a good option if you need to regrade your entire lawn. It’s better to have a professional excavate some of the dirt first so that the level of the lawn doesn’t rise too high.

The best mulches for trees are wood chips, bark nuggets, or pine straw. Depending on your goals, you may want to avoid using plastic, stone, rubber, or wet grass clippings. Plastic mulch prevents water from reaching the mulched areas of your tree, stones don’t offer any nutritional benefits to the soil, rubber can release byproducts into the soil when it decomposes, and wet grass clippings can lead to rot. 

Plastic may prove beneficial in cold climates in the winter, but wood chips are the ideal option for most environments.

Generally, you want the soil for your edible plants to have good drainage, organic matter for nutrients, a loose texture (like loam soil), and a balanced pH level. However, the type of plants you're growing will dictate the exact characteristics your soil needs to thrive. For example, brussels sprout prefers more acidic soil, while broccoli prefers more alkaline soil. 

Wood from black walnut, magnolia, eucalyptus, red maple, and invasive species like tree of heaven are not recommended for mulching. These trees release allelochemicals that can suppress plant growth. Some homeowners, however, use wood from these trees for mulching if it is less potent due to age or concentration, or if the plants are not as sensitive to them.