About past perfect

I’m really confused.
My teacher in school says “when you tell someone that you was learning something when you were little, use I learned〜when I was a child.”
But some people say “you can also I had learned 〜when I was a child.”
What is difference between two?
Also, my teacher says “You can’t use when I was a child with past perfect” But why?

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It all depends on what exactly you want to say. Here are some examples:

When I was a child I used to read a lot.
*When I was a child I learned to play chess. *
As a child I would often read stories to my sister.

In these examples there is no need for the past perfect.

Please let me know if this makes sense and welcome to our forum.

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