You're looking for information on finding admin login pages. Here are some useful points:
dirb https://example.com /usr/share/wordlists/dirb/common.txtpython admin_finder.py example.com admin_paths.txt admin login page finder link
curl -I https://target.com/hidden-admin
maps the entire file structure of a web application to find non-linked directories that may contain administrative functions. Popular Tools & Resources You're looking for information on finding admin login pages
200 OK (page exists), 403 Forbidden (page exists but access denied), 401 Unauthorized (HTTP auth required).<form> with password input field.