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The problem was ForeignKey in Django 1.9 required 1 positional argument in Django 2.0 ForeignKey 2 required positional argument
topic = models.ForeignKey("Topic", on_delete=models.PROTECT)
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The reason of second issue is you missed the command after the command python manage.py makemigrations [appname], the missing command is python manage.py migrate.
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To prevent this, we should use on_delete=models.PROTECT.
By default Django uses on_delete=models.CASCADE but this is not secure if object deleted accidentally.
In that case there would be no notification of deleted objects so it would be ideal to use models.PROTECT.
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