To cultivating it? I had to learn by hit and miss...
many years ago when I had to travel to one gourmet shop in the city that sold it. The produce guy would give me arugula with roots that I would plant and harvest bit by bit. I saved the seeds each year.
What I found works so easily is to stir up the ground...I know there's a real term for that but that's what we have husbands for. Then I broadcast the seeds on the ground when it is wet. I really crowd the plants. They love to grow up together. I do a patch rather than try to keep it orderly in rows.
If they are not crowded, they just don't survive well.
I then just walk gently on the seeds and make sure they are sprinkled gently for a week. They grow.
The plants don't mind a little snow and don't have to be in sun all day. How considerate of them!
I harvest the baby plants as they start to grow, by pulling them out. If the area gets too thin, I clip off seeds only until I have another patch in gear. And I plant 3 times a season to be sure that I have a constant supply.
They self seed each year and I don't mind as I just pull out these things as 'weeds' and eat them. This way, they're already sprouting in March, before I ever get out to the garden. I don't have any problem with them wandering though.
Our favourite way to eat arugula...fresh baguette, goat cheese, roasted red pepper & arugula.