Are you customizing the wordpress and trying to add similar post on the specific location of the page or post. This turorial is helpful if you are fetching a numbers of posts lets say 3 or 5 or something from the specific category on the post page or you are trying to display others similar
Do you need the multiple feature image for a page or a post? Then the WordPress MFI or Multiple Feature Image Plugin is right for you. You can get is from the link here. Please follow the following procedure.
Why to server images from subdomain While Hosting our images on our own webhosting, this is default in wordpress powered websites. while counting the request (this is the http request sent to the server shortly lesser the request the better the performance. This will be dividing the request to multiple domains) specially in wordpress is