How to use gossip? Is gossip fortune telling a science?

Don't bother. Gossip fortune-telling was originally used to correct the behavior of the gentleman in the Book of Changes, not for fortune-telling. Just buy a book of changes and read it. After the eight diagrams are derived, the sixty-four hexagrams are a chain. Everyone has been circulating on this chain all his life, and there is a big chain outside the small chain. You can use gossip to calculate which part of the chain you are in and infer what action to take next according to the seal text.