SOLUTION

The image on the left is a flag from Maritime Flags. The flavor text gives the words RULE (Something you follow) and SEED (Something you sow), indicating that the numbers on the right are rule seeds to use.

1213 = P

30 = L

1367 = U

38 = M

897 = B

231 = I

256 = N

289 = G

When looking at the letter for the flag in each rule seed, it gives the solution.

PLUMBING