Examples of inter-cropping would be to plant and allow cantaloupe vines to grow beneath corn. Or, plant vegetables that mature early between rows of vegetables that mature later. For instance, sow radishes along with carrots. The radishes will have been harvested before the carrots are 2 to 3 inches high. Utilize the 16 inches between broccoli plants by planting some leaf lettuce, which will mature much sooner than the broccoli.
Succession planting makes common sense.
When you've finished a harvest of one particular crop, sow something else in its place. You can get a head start by growing seedlings, and transplanting them into areas that have been vacated by a previous harvest. Before the weather will allow you to do much digging in the garden, outline what you want to plant and when. Once your garden is on paper, you are ready to begin. And, about that time, Mother Nature will be ready for the gardening season.