The relationship that you have with your lawn will depend largely upon how you treat it, literally. Over time, it will be necessary to treat your grass for a number of things---possible insect problems and routine feeding are among them. To make the most of grass treatments, some will need to be done with consistency, others on an as-needed basis. Treatments will vary according to grass type.
No matter what type of grass you grow, there is one thing other than weeds that you will have--thatch. Thatch is a layer of stems, roots and leaves that is found just beneath the grass but above the soil line. While thatch is normal, too much of it is not good. An overgrowth of thatch prevents new grass from growing and acts as a barrier to water and nutrients getting through. Thatch can be removed manually or with mechanical equipment. Grass should only be dethatched in cooler weather and only when needed.
In order to implement a good fertilizing schedule to treat your grass, first know the condition of your soil. Determine the level of nutrients present to properly feed your grass with the right fertilizer. Your local county extension service can conduct a soil test. Determine the proper time to apply a fertilizer. Consider the length of your lawn's growing season and the climate in your area when setting a schedule for fertilizing.
Periodically, give your grass a little bit of breathing room, by aerating it. You aerate your grasses when you remove small plugs of soil from a lawn. The results encourage new growth as more oxygen is able to reach the roots. Aerate your lawn at least once a year---cool-season grasses in the fall and warm-season grasses in the spring.
At some point during its growing season, weeds will very likely sprout in your grass. Because weeds vary with each type of grass, first identify the type of weed present to effectively eradicate it. Several treatments are available to remove weeds from a grass---treat with an herbicide, use nontoxic products or manually pull them by hand. When you establish a weed treatment program, note what type of weed grows and when so you can address a possible ongoing problem.
Much like weeds, there is bound to be some type of pest issue at some point during the life cycle of your grass. Identify the insect and decide whether you will respond by chemical or natural means. Effective pest management means addressing the issue before an infestation ensues.