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Quick Answer
Beginner guitarists do not need a separate metronome on day one, but they should practice with one early. A physical tuner/metronome combo is useful if you want one small practice tool that does not depend on your phone.
If you already use a tuner app, start there. If your phone distracts you, a small tuner/metronome is a practical upgrade.
Related: Phone Tuner vs Clip-On Tuner and Beginner Guitar Starter Kit Canada.
Beginner gear that removes practice friction
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