The number of colors really depends on the simplicity or complexity of your home. Adding too many colors to a home that's really designed to have a maximum of 3 or 4 colors will make the home look garish, and the exterior paint colors will come off as garish. Look for homes with similar architecture, hopefully by the same builder, and see what others have successfully done.
Definition: A debit is an accounting entry that either increases an asset or expense account, or decreases a liability or equity account. It is positioned to the left in an accounting entry.
The cash account, like all asset accounts, is a debit account. This means that debit or left entry in the cash account would increase the cash account. A credit entry would do the opposite. Cash is recorded as a current asset on the balance sheet.