N5 Lesson 4: 1/15
の のは のが

verb nominalizer
the one who...
that which...

[nominalizes a verb]
Cannot be used in fixed phrases like ことができる, ことがある, etc., or when it is on the end of sentence and followed by だ/である/です. This is because it becomes an explanatory の in that case)

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I am the one who does this job.
["to do this job" becomes a noun]

Marugoto Elementary 1 (A2) Rikai : Page 42
みんなの日本語 II : Page 84 [CH 38]
[DBJG] A Dictionary of Basic Japanese Grammar : Page 7, 318 & 337
Tae Kim's Japanese Grammar Guide : Page 70