There are many laws enumerated in the written and oral Torah. One of their categorizations is those which are obligatory inside the land of Israel and those which are obligatory both in the land of Israel and outside.
The second grouping is what constitutes the Shulchan Aruch.
But non-obligatory doesn’t necessarily mean irrelevant. There are many agricultural laws only obligatory in the land, for example.
But is what they oblige us to do inside the land of Israel, also relevant in terms of what they teach us everywhere?
In the overall sense of good conservatorship, do those laws indicate to us proper behavior in all places, even though they are not obligatory?