If you're planting in single crops, rotation can be as simple as: Grow heavy feeders, followed by light feeders, followed by a cover crop, then repeat. Interplanting can complicate this. I often grow early crops in a block, then follow those with a late cover crop, which remains until late
spring. Then I
plant heavy feeders. Often when interplanting, you'll have heavy feeders combined with legumes and root crops in the same beds. I find it easiest to rotate blocks, with some form of cover crop being grown in each area every 4-5 years. If your soil isn't good, cover crop it more often. The type of ideas that help in the short term are to follow early peas and salads with main season tomatoes or cole crops. As the peas die, the nitrogen they've accumulated will become available to the next crop.
Rick