Looking for logging into the Federated Salesforce site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Federated Salesforce site. After that you can login as usual with your login credentials.
https://help.salesforce.com/apex/HTViewHelpDoc?id=sso_tips.htm
https://developer.salesforce.com/docs/atlas.en-us.identityImplGuide.meta/identityImplGuide/identity_quickstart_fedID.htm
https://trailhead.salesforce.com/en/content/learn/trails/identity
https://trailhead.salesforce.com/en/content/learn/modules/identity_login/identity_login_sso
https://www.forcetalks.com/blog/how-to-force-user-to-login-with-federated-sso-only-and-restrict-login-from-standard-url/
https://www.forcetalks.com/blog/federated-authentication-using-saml-to-log-in-to-salesforce-org/
https://salesforce.stackexchange.com/questions/8785/using-federated-sso-can-we-force-users-to-login-through-sso-only-if-we-do-can
https://salesforce.stackexchange.com/questions/192764/how-to-exclude-api-users-from-federated-sso
https://www.oracle.com/technetwork/java/salesforce-138175.html
https://saml-doc.okta.com/SAML_Docs/How-to-Configure-SAML-2.0-for-SalesForce-Federated-ID-.html
https://www.jitendrazaa.com/blog/salesforce/step-by-step-guide-to-setup-federated-authentication-saml-based-sso-in-salesforce/
https://ping.force.com/Support/PingOne/PingOne-Setup/PingOne-Configuring-Salesforce-com-to-use-the-Federated-ID-for-SSO
https://www.sundoginteractive.com/blog/authentication-with-salesforce