Lead Conversion Data Mapping

• I am afraid that I will lose my data if I convert a Lead to a Contact or a Deal. What should I do?
• What are the benefits of mapping the fields of a Lead to other modules?
• Why are some fields from Leads already mapped by default?
• Can I delete the default mapping?
• How do I add a mapping for lead conversion?
• How do I delete a field mapping in Lead conversion?
• How do I modify a field mapping for lead conversion?
• Why can't I see the Leads Conversion Data Mapping setting in the CRM?
• Can I add any field from Leads as a part of field mapping?
• Why cannot I map the Created Time field from leads to contacts?