Wordpress show me 404 on some pictures - wordpress

I made a backup ok large website made with WordPress, and I get 404 in some pictures. I saw that on those picture that failed to load the resized version work well

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why WordPress website showing readme page on my home page

I am facing a problem if i am opening my website with domain name it keep showing the readme page of how to install wordpress and if i am opening shop from wordpress dashboard the shop page open and website's other pages work properly only home page is showing readme page. Its really complicated to explain. if you understand so.
can any one help me to solve this problem.
I have tried many things to solve by getting backup and reuploading the website but the hosting i have that not have the feature to getting backup and now i cant make changes in public html files and i have watched youtube videos get the solution but there is not a single one video bout that.

Failed to load resource: net::ERR_HTTP2_PROTOCOL_ERROR on WordPress multisite

When I trying to customize any page in any site I get this error in the console of the browser inspector.
and the screen gets interrupt..
please see image below...
I'm running this WordPress multisite instance on a OpenLiteSpeed Web server.
Please help me out what is causing this error I spent hours searching for solution and no results.
There are several reasons, one of them has to do with the text being too large on the same line. In my case it was a text coming directly from the database, I just changed the text through the database and everything was fine.
From what I've researched, there are also other reasons, such as file size limit and even the server with full storage.

Facebook Instant Article error 403

I recently implemented Instant Articles for WP Plugin on my Website. Everything works fine except for the download of the uploaded images.
Here is how the error looks like:
General Errors: Could Not Download Image: Your image from URL http://www.theincentral.com/wp-content/uploads/2016/08/CnJ4p4WVYAAfC4O-575x337.jpg could not be downloaded with an error code 403. Please check to make sure image at http://www.theincentral.com/wp-content/uploads/2016/08/CnJ4p4WVYAAfC4O-575x337.jpg is active and loads correctly at that URL.
The image in the URL is accessible just not by the Instant Article. The result is that when the Article is published, the images are not loaded (They work fine on the website).

Wordpress pages on frontend and backend are loading very slow after adding thousands of images in its Media Gallery

I have a Wordpress site, before it was working good all pages on backend and frontend was working well but when I add thousands of images in wordpress media gallery via Add-this-Server Plugin. The site has been too slow. Pages on backend and frontend working too slow and sometimes they show 500 internal server error.
I looked around on internet for its solution and find some answers like increase memory_limit by writing this code(define('WP_MEMORY_LIMIT', '512M');) to wp-config.php file.
But this also did not worked.
Please give me suggestion why it is happening.?
How can I remove this error and increase page loading speed.?
Thanks

My WordPress Site Shows 404 Error When I Try To Post.

For more than 4 days now, i cannot publish my WordPress website.
It shows: 404 Error when i try to publish a post in the website or do anything that will load to another page.
Also i cannot work on the widget area because it's not saving any work there.
I have tried re-saving the permalinks and also even deleted the .htaccess file and upload another one and yet no sign of working.
What is the main problem please?
404 Errors are usually URL related. Make sure Wordpress and all of your plugins are up to date. I would also change your permalink settings and see what happens.

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