How does the OBS recording program work?

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I would like to record fortnite videos for youtube and the program OBS was recommended to me, unfortunately I don't understand how it works

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Open OBS and add a new source. Simply click on the "Plus" symbol under Sources (bottom left). You can then adjust the image size as you like. Also pay attention to the sound by clicking on the gear icon under the audio mixer. Select the audio device here under Properties.

Then start recording.

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Yes but which source the

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