Is it Cusco or Ayacucho Quechua? Struggling with the vowel shift.

I'm a false beginner who learned a few phrases from family, but I'm getting really confused by the vowel variations between different regions. When I look at texts, I see 'qillqa' vs 'qelqa' and it makes me freeze up when I try to speak because I don't know which norm to follow. Should I pick one regional variant right now to avoid burnout, or is there a standard spelling convention that works for both?