May I ask about introduction

May I ask about how to introduction yourself ?

I have a question .『 Χαιρετε, λεγομαι （name ）. χαιρω πολυ για τη γνωριμια.』
and 『 Γεια, λεγομαι(name). χαιλω πολυ. 』are absolutely same meaning ??
I'm sorry i can't find good answer in my language. (..)
english is ok. Please somebody tell me.

Χαιρετε = Γεια σας = Hello (formal)

λεγομαι = my name is (formal)

χαιρω πολυ = nice to meet you

Γεια or Γεια σου = Hi - Hello (informal)