All transactions are colour-coded based on their contribution to the Wealth Equation.

Your transactions are divided into 4 categories:
You can change the type of any spending from Bills to Variable in the transaction details:

Nova automatically changes the type to Wealth when you recategorise a transaction as Investment:

Two types transactions are excluded from the Wealth Equation:
Internal transfers represent transactions you make across 2 accounts connected to Nova. They're excluded because these transactions represent a zero-sum game and don't contribute to your Wealth Equation. For example: