Some openings are considered more challenging for beginners, and others might be less popular or considered dubious at the highest levels of play.
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@22
"By openings I should never play, I mean openings in which my opponent can unequivocally put me in a bad position no matter what I play."
++ Then 1 a3, 1 h3 do not fall into that category.
On the contrary almost all openings with "Gambit" in their name satisfy your criteria.
Giving up a tempo is not as bad as giving up a pawn.