1. Who gives you advices of worries?

2. Who gives you advice of worries?
2-1. Who gives you the advice of worries?

3. Who gives you pieces of advice of worries?

4. Who gives you the pieces of advice of worries?

5. Who gives you the piece of adivice of worries?

(Which ones are grammatical and commonly used?)

1. Who gives you advices about worries?

2. Who gives you advice about worries?

2-1. Who gives you the advice about worries?

3. Who gives you pieces of advice about worries?

4. Who gives you the pieces of advice about worries?

5. Who gives you the piece of adivice of worries?

(Which ones are grammatical and commonly used?)

In your first post -- using "of worries" -- all are incorrect.

In your second post, the only two that are correct and commonly used in the U.S. are 2 and 3.

1. Who gives you advice on worries?

This sentence is grammatically correct and commonly used. It is asking about the source of advice concerning worries.

2. Who gives you advice on worries?

This sentence is also grammatically correct and commonly used. It is asking for the source of advice specifically related to worries.

2-1. Who gives you the advice on worries?

This sentence is grammatically correct, but it is less commonly used than the previous two. It asks for the specific advice given about worries without specifying who gives it.

3. Who gives you pieces of advice on worries?

This sentence is grammatically correct and commonly used. It asks for the source of multiple pieces of advice concerning worries.

4. Who gives you the pieces of advice on worries?

This sentence is also grammatically correct and commonly used. It emphasizes the multiple pieces of advice related to worries.

5. Who gives you the piece of advice on worries?

This sentence is grammatically correct but less commonly used. It asks about a single piece of advice specifically related to worries.