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Consistency makes a product feel cohesive. Inconsistencies can make the product feel broken, disjointed or confusing, and can distract the user from completed their ask.
An ideal system helps the user complete their task without Help & Documentation. However, it does need to be available and easily accessible for the user to find just in case.
Use Affordances. Affordances are the properties of an object or interface that show how it can be used based on prior knowledge.