40 Side is the third track off of Nas' 13th studio album King’s Disease II.
The track actually features a sample from
Lil Baby.

A 40 Side is a ghetto in New York, specifically one in Queensbridge, which Nas had previously referenced in his classic track Halftime on Illmatic.

Nas opens up about the things going on in the projects and gives pieces of advice to the younger brothers striving to make a living.