hello, i want an example of backend and frontend integrated with ory kratos, hydra and keto self hosted.

Hello @glamorous-house-45546 since it heavily depends on your use case what this would look like, its hard to have one example for all of this - however have a look at our community examples here: https://github.com/ory/awesome-ory, you can find examples for multiple Ory services together here: https://github.com/ory/awesome-ory#ory-ecosystem-1