Lay betting

if i lay agenst over 2.5 goals dose their have to be 3 goals to win

So if I understand this right, you are laying over 2.5 goals. Easiest way to think of laying is ‘I assume everything but this will happen’ as apposed to the usual ‘I think this will happen’ So if you lay over 2.5 goals it is the exact same as betting under 2.5 goals. Infact in 2 option cases because these events are the same exchanges will basically bet and lay for you on both sides of the market. (I cannot confirm is smarkets does this but I can confrim betfair does)