I am learning English grammar. I am not a beginner and I am following an English grammar book to improve my grammar. The book gives some examples of intransitive verbs (verbs that don't take any objects) like come, go, arrive. An example is given below from the book
We arrived at 11.
Now my question is: Isn't it confusing? I can say We arrived at the airport. or I came to school.
How can there be intransitive verbs or verbs that don't take objects?