I'm kind of new to gambling so what's the point on betting on a 1/1 line? I see it all the time
The first number is how much you win relative to the second number, your bet.
1:1 means you win $1 for every $1 you bet. Place a bet for $10, and win $10, meaning you receive $20 (your bet + your winnings).
3:1 means if you bet $10, you'd win $30, for a payout of $40.
1:5 means if you bet $10, you'd win $2, and get paid $12.