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What is default login process for sites hosted on WordPress? How do I view the source code?

I am trying to make a WordPress site such that customers can create accounts on my website and log in there. What is the default process for this, without using plugins? Is it the /wp-login.php subdomain?

I have also turned off "Allow users to log in to this site using WordPress.com accounts" from Settings → Security

How can I view the source code of my site? I am particularly interested in observing the source code of the login page. How do I view the source code for wp-login.php page? I understand that I can view the source code for other pages like single.php, page.php.

Please guide, I am new to WordPress and in urgent need of help.