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人に出来ることには限りがある
What is the point of the second に? Would the sentence have a different meaning or be grammatically incorrect if it was just 人に出来ることは限りがある? Any help in understanding this would be very helpful because I feel like I often see this construction.
「に」is needed here because of 「ある」. This is a 「B に A がある/いる」 "There is A in/at B" construction.
「は」is a topic marker that elevates the location/place (B) to the topic. The subject is the thing (A) that exists.
