enumerate the site...
- try /robots.txt
- are there cookies?
- try to set your own cookies
- try default common passwords
- Open Dev Tools to inspect Elements, Network requests, front-end source code
- Firefox: ( cmd-opt-I, or right-click > Inspect, or Tools > Web Developer Tools )
- source code is in "Debugger" Tab
- Chrome: ( cmd-opt-I, or right-click > Inspect, or View > Developer > Developer Tools )
- source code is in "Sources" Tab
fuzz the login or endpoints to find hidden urls
- ffuf
- Burpsuite Repeater / Intruder
- ZAP repeater
inspect requests
GET
- are there query parameters?
- try SQL injections in the parameter
- try to manipulate any data that is sent in the body
POST
- what kind of data will it accept
- try to manipulate data that is being sent