I first began by opening my favorite web browser, Google Chrome. Since it's URL address bar automatically searches Google, I typed in "Who led for stolen bases in National League in Major League Baseball in 2002?
The closest match on Google's list was a Wikipedia's Stolen Bases database. I searched through it and did not find it much help.
So I went back to the original search results and then saw the Baseball Almanac's "Stolen Bases Year-by-Year Leaders" page and click on it. After using the Find tool on Chrome, I searched for the phrase "2002." And the two leaders that came up were Alfonso Sariano with 41 and Luis Castillo with 48.