capabilities

using map_meta_cap I added edit_post per post cap to user function my_map_meta_cap( $caps, $cap, $user_id, $args ){ if ( ‘edit_post’ == $cap ) { $post = get_post( $args[0] ); $post_type = get_post_type_object( $post->post_type ); $caps = array(); if ( $user_id == $post->post_author ) $caps[] = $post_type->cap->edit_posts; else $caps[] = $post_type->cap->edit_others_posts; } return $caps; } add_filter( … Read more

Yes, you can run WordPress with your own domain if you purchase hosting for it. WordPress has system of Roles (which can be further enhanced via plugins), you can let users register and allow to perform actions accordign to their role. Essentially yes. You copy WordPress files to server and initiate brief installation procedure. First … Read more

you can assign capabilities directly to user using the class WP_user::add_cap() //to remove capability from user $user = new WP_User( $user_id ); $user->remove_cap( ‘can_email’); //to add capability to user $user = new WP_User( $user_id ); $user->add_cap( ‘can_email’); Source – https://wordpress.stackexchange.com/a/60433/17968

I’m adding a second answer because my first approach got voted down and this one didn’t get proper attention. The idea is to create custom meta box that lists all the users and changes the author in save_post hook. This way you don’t mess with users capabilities and the author change happens when the posts … Read more