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_common usage for web forms:
first you need to know the payload or form fields used. for that you can do the following,

1. load the site
2. open dev tools
3. go to network tab
4. select the request to inspect
5. go to payload tab
6. click "view source"
7. collec the payload

you will see something like this, will be needed

username=^USER^&password=^PASS^
  
SAMPLE:
hydra -L rockyou.txt -p idk -t 20 35.227.24.107 http-post-form "/login:user=^USER^&password=^PASS^:Invalid username"

flags:

-L = wordlist to use
-p = password to use
-t = threads to use 
http-post-form = method to use