His is good advice if you have more land than you need for cropping, and/or animals to run over the resting land.
On the other hand, for small plots it works well to keep soil fertile with compost and keep land cropping intensively. I have moved around a bit but my original garden at Lower Farm was as productive in it’s fifteenth year as its first.
Aa new gardener, I suggest you dare to consider all advice with a good dose of your own sense and intuition because every garden or plot is different. Take the essentials and add the details. Good luck.