Who can tell me what is the relationship between earthly branches, heavenly stems and gossip?

Heavenly stems and earthly branches has little to do with gossip. Zhouyi mainly predicts good or bad according to divinatory symbols, not four pillars and eight characters.

Eight diagrams with five elements, dry against gold, shaking trees, water, away from fire, Kun root belongs to the soil. Zhouyi is based on the five behaviors of these hexagrams, and has nothing to do with the branches.