Helpful snippet that shows all of the allowed blocks that you can use. Removing items from this list will hide them in the Gutenberg editor.
<?php
add_filter( 'allowed_block_types', 'set_allowed_block_types' );
/**
* Set allowed gutenburg block types
* https://rudrastyh.com/gutenberg/remove-default-blocks.html
*/
function set_allowed_block_types( $allowed_blocks, $post ) {
// https://walterebert.com/blog/limiting-wordpress-gutenberg-blocks/
$allowed_blocks = array(
'core/shortcode',
'core/image',
'core/gallery',
'core/heading',
'core/quote',
'core/embed',
'core/list',
'core/separator',
'core/more',
'core/button',
'core/pullquote',
'core/table',
'core/preformatted',
'core/code',
'core/html',
'core/freeform',
'core/latest-posts',
'core/categories',
'core/cover-image',
'core/text-columns',
'core/verse',
'core/video',
'core/audio',
'core/block',
'core/paragraph',
'core-embed/twitter',
'core-embed/youtube',
'core-embed/facebook',
'core-embed/instagram',
'core-embed/wordpress',
'core-embed/soundcloud',
'core-embed/spotify',
'core-embed/flickr',
'core-embed/vimeo',
'core-embed/animoto',
'core-embed/cloudup',
'core-embed/collegehumor',
'core-embed/dailymotion',
'core-embed/funnyordie',
'core-embed/hulu',
'core-embed/imgur',
'core-embed/issuu',
'core-embed/kickstarter',
'core-embed/meetup-com',
'core-embed/mixcloud',
'core-embed/photobucket',
'core-embed/polldaddy',
'core-embed/reddit',
'core-embed/reverbnation',
'core-embed/screencast',
'core-embed/scribd',
'core-embed/slideshare',
'core-embed/smugmug',
'core-embed/speaker',
'core-embed/ted',
'core-embed/tumblr',
'core-embed/videopress',
'core-embed/wordpress-tv'
);
// if( $post->post_type === 'page' ) {
// $allowed_blocks[] = 'core/shortcode';
// }
return $allowed_blocks;
}This snippet was taken from this gist here. Very helpful!