Some free resources for troubleshooting ovens are RepairClinic, PartSelect, AppliancePartsPros.com and Acme How To. They include both gas and electric ovens. RepairClinic.com has a search option for entering model numbers.
Common problems include the oven not working or working intermittently, making clicking noises, being too hot, having little to no heat when baking, and being unable to broil. However, there are differences in problems depending on whether the oven is gas or electric. Electric ovens commonly have a glow instead of a pilot ignition, and the burners do not require an ignitor to light. They also come with more optional features such as fans.