Fold pre - why would you want to call this and go 5way out of position to the flop with Axs with little chance of a straight . you're going to hate life if you flop an Ace, anyone without won't be paying you off unless they have Ax beat limiting your upside. you got lucky and flopped some equity . A8s isn't strong enough to 3bet short stacked , you could make an argument for 3bet shoving against a single late position raiser short stacked , but you don't have that situation . You have a table of callers so someone will likely call with a better Ax
or medium pair

Flop - you got lucky - you don't have the stack to call , just shove and hope to thin the field, your 8 is blocking some straight flushes and you've probably got around 40% which i think will make it a profitable shove. Btn probably has a set here.

Going to be brutal her but in a constructive way.

Where are your reads ?

Looking at this table

UTG - not fully stacked - min raising UTG, not fullly stacked - fish
UTG+1 - not fully stacked - fish
MP1 - just over half a stack calling an early position raise , folding to a cbet - fish
MP2 - fully stacked , calling min raise and a call pre - probably low-mid pairs, suited connectors, broadways - calls cbet - no set,mid pairs QJ,KQ, XdXd
BTN - not fully stacked (fishy) - looking toi see a flop multiway broadways ,low-mid pairs connectors Arag - raise UTG cbet 90% set 10 flush draw since we block a lot of flush draws and the nut flush draws - probably still a fish.
BB- short stacked , calling pre multiway out of position - huge fish

That is a read developed on most guys at the table from 1 hand , You will have played multiple hands against these guys , you should have been making watching them and making notes on them , learn how lags play , fish play tags play etc .

When you post hands you should be giving your reads on opponents , what ranges you think they have and if we think you are wrong we'll tell you .

You are posting like a fish , looking at your hand and the flop just like every other fish at the table .If you are going to become profitable at poker you need to be look at the table and adjusting the range of hands you'll play Before the cards are dealt, adjusting again after you see the action before you and the number of player still to act and their probably ranges once the cards are dealt and again at the flop turn etc.

I know I should buy in for full stack but I want to learn how to play all stack sizes because I don't have alot of money to keep topping up right now and I want to get used to playing with different sizes.


This is again talking like a fish , "i want to limit the amount i lose " rather than "I want to maximise the amount i win".
You are missing the fact that if you keep calling multiway OOP you will bleed chips and still have to top up.You won't learn to play post flop as a lot of the time the decision will be all in or fold like this case as you don't have the stack depth to be able to call profitably .