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Where should I start?

Create a simplest spring boot resource owner password grant authorization server.

https://docs.spring.io/spring-security-oauth2-boot/docs/current/reference/html/boot-features-security-oauth2-authorization-server.html

Using generated security password: 5ba14387-84fb-458a-a301-9a1993f79b55. What is it?

When there is no UserDetail beans, spring (UserDetailsServiceAutoConfiguration) generate a sample username=user, password=<randompassword>.

It's not the clientSecret, it's end user password can be used in Resource Owner Grant password