The Help Center offers you a number of faqs and user guides to search or browse by subject.
The guides are meant to supplement the tutorials in your Reindex itself. Please check your Reindex:
Help > Tutorials
In this Help Center, you may also send us a message to ask a question, or make a request.
The number of guides in English is currently limited. Please let us know if there is a question, or task, that needs a guide.