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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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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.

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