"Unless" is a conjunction which is often translated as "a menos que", and "if not" is a phrase which is often translated as "si no". Learn more about the difference between "unless" and "if not" below.
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A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
a. a menos que
It is not possible to understand binary unless you have studied it. Es imposible entender binario a menos que lo hayas estudiado.
b. a no ser que
Unless you arrive early in the morning, the wait for breakfast can be about an hour. A no ser que llegues temprano por la mañana, la fila para el desayuno será aproximadamente de una hora.