Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Hi guys, does anyone know if exist a course of ory kratos self-service?

Not afaik but there's a few resources online in addition to the official docs. Also example repositories that you can look at to see how it's implemented in quite a few frameworks. If you add some more information I can help you in the right direction.