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To obtain a field value in an aura attribute in Salesforce, you can use the following syntax:

<aura:attribute name="fieldName" type="DataType" default="Default Value"/>

Here, "fieldName" is the name of the attribute, "DataType" is the data type of the field value, and "Default Value" is the value to be assigned if there isn't any value in the attribute. You can then retrieve the value of the field using {!v.fieldName}.

To utilize an if statement in a component, you can use the following syntax:

<aura:if istrue="{!expression}"> </aura:if>

Here, "expression" is the condition you want to evaluate. If the expression is true, then the component or HTML within the aura:if tags will be displayed. If the expression is false, then nothing will be displayed. You can also use {!if(expression, trueValue, falseValue)} as a shorthand for an if-else statement.