Good

Good is about as plain as an aura gets, and that is the point. It is a Basic-tier aura from before the Main Update, created by ep1k_solg, and it rolls at 1 in 5. That means you will typically see one every five rolls at 1x luck, and the wiki calls it the most common obtainable aura that does not follow the usual power-of-two rarity ladder.

The Sol's RNG Wiki describes a minimal effect: white particles start at the player's feet, float upward around the body and gradually fade. Its description in the game is simply that it is a very good thing. In the early days its effects were almost identical to Uncommon, until Uncommon was reworked and the two stopped looking alike.

Because it is so common, Good tends to appear as a stepping stone in the earliest part of the collection, and a stack of them barely affects anything. If you want to chase something with a story, Goose Rave or Gothic offer much more to look at, but this is the aura most players meet first in the G section.