Looking for logging into the Salesforce Rest Api 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 Salesforce Rest Api site. After that you can login as usual with your login credentials.
https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/intro_understanding_authentication.htm
https://developer.salesforce.com/docs/atlas.ja-jp.api_rest.meta/api_rest/quickstart_oauth.htm
https://developer.salesforce.com/docs/atlas.ja-jp.api_rest.meta/api_rest/intro_understanding_username_password_oauth_flow.htm
https://developer.salesforce.com/docs/atlas.ja-jp.api_rest.meta/api_rest/intro_understanding_web_server_oauth_flow.htm
https://web.plus-idea.net/2016/06/salesforce-rest-api-call-setting/
https://qiita.com/na0AaooQ/items/a6f733f13a79658da956
https://stackoverflow.com/questions/9258653/salesforce-rest-api-login
https://stackoverflow.com/questions/21905498/salesforce-php-rest-api-with-automatic-login
http://crmprogrammer38.hatenablog.com/entry/2017/11/08/132019
https://salesforce.stackexchange.com/questions/163256/rest-api-to-authenticate-with-basic-username-and-password
http://kayakuguri.github.io/blog/2016/12/07/sf-rest-api-postman/
https://community.boomi.com/s/article/howtoconnecttosalesforcerestapiwithoauth20
https://engineering.gosquared.com/salesforce-rest-api-integration