You look at the amperage rating and add them all together if that’s over your limit (usually 15 A like you mention) you would have a problem.
It depends on the type of device but very few of them draw more than 1-2 amp unless its a heater or has moving parts (like a blender or something) So you can easily plug in about 7-15 devices with no real problem.
Those are also their peak ratings. For example I have my desktop PC, 3 monitors, 2 phone chargers, and a VR head set, an all plugged into one outlet and running right now. The peak for all that is about 8 A but its currently drawing 0.54A
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