First things first. Soil preparation. This is one of the most basic things that any new gardener will have to learn. Whether you plan to use a plot of land in your backyard or start a vegetable garden in plant boxes, soil preparation plays an important role in whether your vegetable garden will survive or not. There are three types of soil that you need to be familiar with; sand, clay and silt. Sandy soil is loose and helps the roots of plants breathe because it lets the air pass through easily. Clay soil absorbs water faster and keeps it inside longer, a soil composition that has more clay particles in it would be ideal for places that are too hot and the soil dries up quickly. Silt is a fine mixture of sand and clay particles.
When preparing the soil for your vegetable garden, dig up the soil and break off the lumps. Take out the rocks, roots, and weeds while you're at it. Check if you have just the right mixture of sand, silt, and clay before you begin planting vegetable gardens. Ideally, silt and sand should both be 40%, and clay should just be 20%, this is to make sure that the water isn't trapped inside too much that the roots will choke. Also, if the water is trapped too long inside the soil, the roots will rot. One good way to test whether the composition of your soil is good is by scooping out a handful and forming a ball with it. The soil should hold the shape of a ball without too much difficulty. If the soil cannot hold the shape, you might have too much silt or sand in the mixture. If the soil holds the shape but does not crumble easily when you poke it, it might have too much clay in it which you need to balance out with a little silt or sand.
Once you have finished cultivating the soil where you want to plant your vegetables, pick what kind of vegetable you want to grow there. Keep in mind that some vegetables don't grow well when you plant them too close to certain types of other vegetables. Potatoes, for example, shouldn't be planted too close to squash or tomatoes because it inhibits their growth. They can be planted in the same garden, just don't plant them beside each other.
After you have decided on the kind of vegetables you want and planting them into the cultivated soil, you'll have to learn about how to water them properly. Vegetables need to be watered consistently. When planting vegetable gardens in a big space, you might want to consider using a soaker hose. A soaker hose has many holes along its body that waters your garden by letting the water seep through its holes.
Planting vegetable gardens require manual labor (yes, actual work), and a lot of patience. The rewards are very well worth it, though. Especially for people who are concerned about their health. Growing your own vegetables makes sure that there's the least amount of poisonous (and in the long run, carcinogenic) particulates in it as possible.