After the many, many trials and errors that come with planting a garden in Central Oregon, I have slowly learned a few tricks. One very helpful tool in planting a garden is to consider companion planting and crop rotation.
In a nutshell, companion planting involves placing plants in your garden near their "friends." Believe it or not, certain plants prefer other certain plants! Crop rotation is simply the notion that you rotate what you plant in a certain area of your garden in order to maximize the nutrient ebb and flow in the soil.
Below are two images I have printed and tucked in my garden notebook for easy reference. You can also find them Pinterest. The source of the images can be found on the bottom of both.