umarzaki

No the source of this error is not WP itself this is happening because some of your plugins is not updated to be compatible with php 8.2
so try to check plugin update or disable them.

Some of your site plugins are not updated to work with PHP 8.1 so thats why these are making conflict.
First Try to update plugins manually if still issue then hire developer who will update conflicting code.

There is issue with the plugin its generating pages links like https://techqik.net/page/2 but it should need to generate like https://techqik.net/?page=2
The solution for this is to add rewrite rule to your wp code.

add this custom css code in your site.
a {
border-bottom: none?!important;
}

these php warnings you can easily disable it in WordPress debug false and also disable php level warnings.

I think this is happing because you have not switched on the guest order feature in your system.

First of all you need to verify that you are editing the right database after that just the user table and set the right administration rights to user carefully.

All you need to do is just go to setting and changes post permalink types this will solve your problem.

This simply looks like its CSS overriding issue you can simply resolve it by adding custom css in admin side appearance section.

This looks like there is error in db bacause its sending activation link wordpress is detecting its not installed properly.

This is not happing because of the files permissions. There will be two major causes for this. First check your logged IN user that its has administrator role or not if its ok then go to your cPanel and search for mod security and disable it. Because some times security modules marks some files as suspicious so in that cases this occurs.

This is happening because the plugin you have activated is not compatible with the latest version or php. first disable plugin and download latest version of plugin.

its just html css code. adding css code in wordpress is not tricky and does not need any special coding knowledge just go to your appearance section and add custom css there.

You need to download custom role manager plugin for wordpress

and set role for other admins remove password update permission from them this will help you.