when should an action be added to init and when should it be added to wp_head

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How do you know when to add your action to init or wp_head. In particular with regards to scripts and styles, but also any other action.

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  1. From Codex Action Reference:

    init Runs after WordPress has finished loading but before any
    headers are sent. Useful for
    intercepting $_GET or $_POST triggers.

    wp_head Runs when the template calls the wp_head function. This hook
    is generally placed near the top of a
    page template between <head> and
    </head>. This hook does not take any
    parameters.

    Basically wp_head runs when page is already being loaded, while init runs before that.

    Also don’t forget that init fires on admin pages as well and anything front-end related must be excluded from there with !is_admin() check.