many are asking.
that problem could have with an A and a short kicker?
the problem is that when leaving an A on the flop and you do not want Remove any bet you make the opponent knowing that you are losing by the kicker.
so it is best to fold these cards when they are not suited: A with 2,3,4,5,6,7,8.
If you are a beginner, I wouldn't fault this. Folding all these hands pre is never a big mistake. It's a whole 'nother story once you get comfortable playing post.
If you are not a beginner, then you can play these hands profitably. The ones you list aren't created equal.
( A, 2-5 ) has straight potential. It will be the idiot end of a small straight, but it's less likely your opponent(s) will be playing six's or seven's than they'll be playing big Broadways. A ( 9,8 ) on a ( J, T, x ) flop could be a disaster waiting to happen if a queen rolls off. It's less dangerous if a five rolls off when you have ( A,3 ) on a ( 2, 4, x ) flop.
( A, 6-8 ) have no straight potential, but the kickers are better, and ( A,9 ) is more of a fixed limit hand that can make a TPTK on dry-ish boards. (TPTK is a better FLHE hand as it wins a lot of bets, but doesn't cost you very many when it gets beat: it won't cost you your stack.)
All of these hands are good stealing hands from the BTN or small blind, as you have something to fall back on if you get called.
The other consideration is that you don't want to be betting/raising with hands like ( A,6-8 ) since you'll chase out aces with lower kickers, and get called or reraised by better aces. With ( A,2-5 ) you can bet or raise as you want ( A,6-9 ) out, and finding the "Fold" button isn't hard if your opponent comes over the top in a big way.
In short handed pots, any lone ace is playable for an open raise. These weak aces can be tricky to play, but if your post flop game is in order, you should be able to play them for profit, given the right villains and situations.