For newcomers, there are plenty of bet calculators online that will help you understand the payout of your bet and what money you would receive if your bet were to win. But, the following example will be an indicator of a typical bet you will see over time in the online sports betting world.
If you were to bet on a football team to win at the odds of 2:1 (2/1), this means that for every 1 you place, you will receive 2 of those and your original stake back.
So - if you were to place £10 on 2:1 and the bet won, you would receive £20 profit and your original stake in your account (£10 on a 2:1 pays £30).