"Importar" Means both "to import" and "to matter" about something.
When we say "não importa" It's "Matter" meaning.
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October 27, 2017
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"Pra" Is just a contraction of "Para a (Some feminine noun)". Just like "Pro" means "Para o (some masculine noun)"
It's used informally. At written language, it's better to use "Para"
Hope it was helpful!