How do I solve the fatal error for wordpress? - wordpress

Question

I have updated the version of wordpress, and my webpage has not been working all of a sudden.
I have debugged to see what the problem is, and I could not understand any of the explanation that is written. I have spent hours trying figure out what it meant, and still could not grasp what I have to change and add. Could someone please explain what it means, and what I must do in order to fix this? Is there an instruction written in the notice & error? I am sorry if I did not provide enough information, I am very new to coding and web page making :(
Notice: date.php is deprecated since version 5.3.0! Use
wp-includes/class-wp-date-query.php instead. in
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/functions.php
on line 4719
Notice: class-oembed.php is deprecated since version 5.3.0! Use
wp-includes/class-wp-oembed.php instead. in
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/functions.php
on line 4719
Notice: Undefined property: wpdb::$blog_versions in
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/wp-db.php on
line 659
Warning: call_user_func_array() expects parameter 1 to be a valid
callback, function '_wp_add_additional_image_sizes' not found or
invalid function name in
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/class-wp-hook.php
on line 288
Fatal error: Uncaught Error: Class 'WP_Block_Styles_Registry' not
found in
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/script-loader.php:2899
Stack trace: #0
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/class-wp-hook.php(288):
enqueue_block_styles_assets('') #1
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/class-wp-hook.php(312):
WP_Hook->apply_filters(NULL, Array) #2
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/plugin.php(478):
WP_Hook->do_action(Array) #3
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/script-loader.php(2853): do_action('enqueue_block_a...') #4
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/class-wp-hook.php(288):
wp_common_block_scripts_and_styles('') #5
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/class-wp-hook.php(312):
WP_Hook->apply_filters(NULL, Array) #6
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/plugin.php(478):
WP_Hook->do_action(Array) #7
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/script- in
/home/vol10_1/epizy.com/epiz_24728949/htdocs/wp-includes/script-loader.php
on line 2899
There has been a critical error on your website.

Answer 1

Seems like the update went wrong and some files got corrupted.
You can try this to fix it:
Download a new Wordpress installation zip
https://wordpress.org/download/
Remove the folders wp-admin & wp-includes from your server
Reupload those folders from the fresh downloaded Wordpress zip
Note: this does not delete your site content, the content of your website is in the database and in the wp-content folder.

Answer 2

Your wordpress version 5.3 need php 7.4 version to be runned properly
so you need to upgrade your php version
or downgrade you wordpress version to 5.2 and disable wordpress auto update
// wp-configs.php
define( 'WP_AUTO_UPDATE_CORE', false );

Answer 3

PHP Version 7.2.18-1
WordPress 5.2.4
I am running 5 sites on same environment
you need to update your PHP version and use a stable WordPress version