PREVENTION
Mulches block sunlight and don't allow plants to grow. Use in walkways, under bushes are tress or along fences where mowing is impossible. Pile mulch at least 3 inches deep.
Bare soil is an open invitation for something to grow. Plant something that you like; don't invite something that you don't like.
Soil that has been sprayed or trampled for many years is not healthy soil. Plants that we call weeds are the only ones that can grow in these harsh conditions. Tolerate the 'weeds' and let them regenerate the soil. Cut them when they flower so they don't go to seed.
Lawns cut too short allow weeds to grow. Look as you are cutting and make sure that there is a thick layer of grass.
Don't let weeds go to seed. Mustard produces 13,000 seeds per plant. Mow, cultivate or graze before seed set.
Take the time to design or redesign areas where weeds always show up. Ask those listed in references for help.
Water only wanted plants. Sprinklers will help everything to grow; drip emitters can be directed to desirable plants.

CONTROLS
Consider that it takes as long to hoe a weed bed as it does to load up a spray tank, spray and clean up. Get some exercise.
Singe young plants with a specially designed torch, called a flamer. Plants are heated up until they wilt, no flames please. This is a good tool for larger areas and can be found at farm and hardware stores.
A single weed does not look threatening. Consider this: Yellow Starthistle has up to 70,000 seeds per plant, a Curly Dock has 30,000, and Common Mullein has 223,000. Control weeds when the populations are small; don't wait until you have a disaster.
Learn which 'weeds' are really bad, and which ones have a good side. Mustard, parsley, and sunflower family weeds are good nectar sources for beneficial insects. Some 'weeds' are protecting soil from water run off or from becoming dust bowls, deep rooted weeds are breaking up hard pans, 'weeds' can be free green mulch for your compost. Some 'weeds' are good at absorbing minerals.
Use plastic (1 - 2 mils) designed to increase soil temperatures, which will kill weed seeds and young plants.
After weed control efforts, make sure that you haven't left a bare area allowing different weeds to move in. Most weed seeds live in the soil for multiple years. (3 - 70 years!) Cover bare soil with mulch or a preferred plant to prevent a continual problem.
Many weeds that are cut to the ground will regrow from underground structures. To control these weeds, dig out as much of the root as you can.