en_tn_lite_do_not_use/gal/02/01.md

went up

or "traveled." Jerusalem is located in hilly country. The Jews also viewed Jerusalem as the place on earth that is closest to heaven, so Paul may have been speaking figuratively.

I should go

"go to Jerusalem." or "go there"

those of repute who were leading the others

"the most important leaders of the believers" (UDB)

for nothing

"for no benefit" or "working uselessly" (UDB)