そんなこと気にしなくていいよ

N4 そんな sonna such, that kind of, so N4 気 ki spirit, mood, feeling, energy N5 いい ii good, nice, okay

N5 気 ki, ke / ki spirit, mind, air

N5 〜ている te iru Indicates ongoing action, continuous state, repeated habit, or resulting condition depending on context N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜と to Indicates company, quotation, natural condition, complete list, or direct connection between elements N5 〜よ yo Sentence ending particle adding information to listener, emphasizes statement, expresses certainty or warning