You cannot build any conditional statement in Excel without using the IF function. Designed to make it easy for you to create a formula that has two or more conditions, IF can be used for many purposes, most commonly to display a result that you can easily identify.
A conditional statement might be best described as: If( condition, value_if_true, value_if_false ). These can be used to resolve a variety of problems, and they can be built up to feature multiple conditions by nesting IF functions.
You might even say: if(understand conditional statements, achieve advanced use of Excel, failure)!