As beginner, What is the best metering mode to use in group photos of 10 or more?
The default mode on your camera should be "evaluative". This is probably your best mode as a beginner. It looks at the overall light level in the frame but gives more weight to the centre area (where you subject likely is).
As you progress, you can move to other types of metering when you need them. Most likely is "spot" when you need a very specific area of the photo to be exposed properly.
Have fun and keep shooting.
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