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So the standard fields(those that you have mentioned - Email, Phone and Lead Source) are mapped like as below(automatically by Salesforce):
Lead Field Mapped to Field Email ⇒ Email field on Contact Phone ⇒ Phone field on Account ⇒ Phone field on Contact Lead Source ⇒ Lead Source on Contact ⇒ Lead Source on Opportunity
So you really don't have to do anything additional as these(the Standard Fields) are mapped automatically to the most appropriate field.
Refer link: Lead Conversion Mapping