burrfrens

Hello hello, just thought I'd do a minor hand analysis incase anyone was interested.
I won't go too into depth but maybe I can help some beginners.

The hand starts when it folds to me on the button
1/2 No limit

I open A2o (offsuit) to 5, this is the only position I would raise this hand from. I would fold otherwise.

Flop

I bet half pot (checking might be better here) and I'm met with a raise. Your first thought might be to fold since we only have ace high, but let's pause for a second.
The flop is fairly dry, meaning there's not a lot of draws, such as a flush draw, people are much more likely to just call flop bets on flops like this as opposed to one's with two of the same suits and/or cards that are sequential, as in TJQ etc. These are known as wet boards.
Since dry boards have more favorable, or at least less "bad" turn cards that complete draws, people are likely to just call with stronger hands.

With that in mind,  what could he have? Sure sometimes he'll have TT(1010) 77 or 55 but i expect these

Interesting hand analysis! It's crucial to consider board texture and opponents' ranges before making decisions. Can't wait to hear how the hand played out!