Working a gambler earn money as they bet on a value probability. They probably have either inside information or have a great racing system to win the odds better than players.
The first way to search for value is first to determine the actual likelihood that the event will happen, then see if and how they are different from actual bookshops available.
Bookmakers do not make many mistakes, but they can still be beaten. For example, a few years ago, two punters traveled all over the country to visit independent bookmakers to get the chance of the Hole in One that happens in a particular golf tournament. They had planned to prove the probability of 2/1 that someone would score a hole at a time in a particular tournament. But they began to take prices from 16/1 to 100/1 from many different bookmakers.
These bookies did not do their homework and thought it was rarely in the hole and taking some mortgage was like money in the bank. These two gamers simply made thousands of pounds simply by getting great value for events that were wrongly earned.
Somehow you have to work in your own mind that the price you think is true about the horse you wish to return.
Using ratings, whether it's form or speed, can be a good tool for assessing betting
Genuine value is usually not worried about supporting other horses than favorites. The favorite is more often than not the horse with the best chance of winning, but the value of the race is often in supporting horses more likely to lose. Support for horses with a price indicating 10% chance of working, ie. 9/1 when the real chance is 20% and 4/1 makes sense. They will not always work, but they will win twice at a good price and you will collect more money than you own.
This is a very simple strategy for gaining value. Search for fake favorites in horse games. They may be favorite because they won their last race but check if it was in the lower class. Or they may be favorite just because the top hockey is on a bicycle but you might have found a horse with a better chance of going to the presidency. Opposing favorites means fewer winners, but you will win enough at a bigger price to see that you collect more money than you think.