Log-In-Login | Commonly Confused Words

Login

/ˈlɔːɡɪn/

The action of gaining access to a computer system or online account by entering username and password

/lɒɡ ɪn/

To enter details into a system to access it

Log in is a phrasal verb that signifies the action of accessing a computer system or service.
Login is a noun or adjective used to refer to the credentials or the page where you enter them.
Remember that actions are typically described by verbs, hence log in for the action.
Objects or nouns, like a page or credentials, are usually named with single words like login.
If you can replace the word with access, youre likely dealing with the verb form log in'.