Type of Race:

Stakes Race: the highest class of race with the biggest purses. Owners typically pay an entry fee to nominate, enter,
and run their horse. The Kentucky Derby is an example of a Stakes Race.

Maiden Race: a race for horses that have never won a race.

Allowance Race: a race that involves conditions such as “non-winner of three races.” Allowance races feature horses
that have “broken their maidens” (i.e. won their first race) but are not ready for stakes competition. Horses are not for
sale in allowance races.

Claiming Race: another form of conditions set by the racing secretary to ensure a competitive field. In claiming races, all horses can be purchased for an amount determined prior to running. Once the race begins, a claimed horse becomes the property of the new owner, though purse money from the race goes to the former owner. This ensures owners won’t try to enter a great horse against lesser competition without the risk of losing the horse to a new owner.

Resources you can use:

Daily Racing Form
Brisnet
Daily News Papers
Track Tipsters