Question

Journals writing are an effective tool for developing new essay topics.

Answer 1

Answer:

Delete the word writing.

*Gradpoint*

Answer 2

I would say that in order to correctly proofread the sentence and fix the error, you need to delete the word writing.
Journals are an effective tool for developing new essay topics.

There shouldn't be a comma after tool. If you change are to is, it is incorrect, because it is said journal writing, not journals writing. Developing is spelled correctly already.