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The second Perek of Nazir presents some of the ways a person can commit (or not) to being a Nazir. While they agree that some kind of verbal declaration constitutes the vow of Nezirut, Hillel and Shamai have a few disagreements about the kinds of external conditions a person can set that would make the vow binding, and what types of animals and items a person can identify as their Nazir sacrifice. Later Mishnayot discuss how previous knowledge of what exactly a Nazir is forbidden to do is an important internal condition about the vow - you can’t claim ignorance or special circumstances to get out of part of being a Nazir. This Perek emphasizes the rule laid out in the first Perek: Even if a person does not specify all of the conditions of Nazirut in their vow and only mentions one (like not shaving or drinking wine), the Rabbis nevertheless obligate him or her in all of the restrictions of the Nazir. It’s all or nothing.
However, the Rabbis recognize that motivation and context are important in order to make the vow of Nezirut binding. In the middle and end of the Perek we find that a person can commit to Nezirut in order to try to stop drinking wine, and can also have their Nezirut and its timing be dependent on whether or not one’s wife gives birth to a son.
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