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start with learning what evolution is OP. Here, you're probably too young to google it since clearly your christian parents filter your internet I'll make it easier.
Creature reproduces sexually. Random tiny mutations happen once in a while during this duplication. These mutations can help or harm the ancestors of said creature. Evolution favors these benefiting mutations, this happens over millions of years. Boom humans. Some adapted slightly to different environments etc creating negligible facial and pigmentation differences.
Just how you can't tell the difference between most dogs so should people with other people. And that my little OP is how evolution works. Best regards, I hope your parents unblock your internet.