Help detecting when it's a post, page and category page

Hey guys i’m doing some tweaks to speed up my website website. I’m just having some troubles detecting when it’s a post and category page. What i’m doing is test if the user is not on a post,page or category page to run the code to disable the plugin’s css.

So far i’ve tried a few options but only when they’re on a page “is_page()” that’s only when the code works. I’m still trying to figure out how to detect if its a post and categories this is my current code so far:

function remove_scripts() {
	if ( is_page() || is_single() ) {
     		wp_dequeue_style( 'plugin-style' );
  		wp_dequeue_script( 'plugin-js' );
	}
}

I’ve also tried “is_singular(‘post’)” instead of is_single but none of both seem to work. Any ideas how to detect if it’s a post and how to detect if it’s a category page? Thanks