Remove Wordpress Theme Widget Support - wordpress

I am creating a theme for a customer using the latest version of Wordpress. The theme/design for their website doesn't not display widgets or a sidebar. How can I remove the "Widgets" link from the sidebar in the admin panel? Also, under the "Manage Themes" page The options for my theme say "Widgets | Menus". I would also like to remove the "Widgets" link if possible.
(source: skitch.com)

This can be done by altering the global $menu array described in this article.
http://www.wprecipes.com/how-to-remove-menus-in-wordpress-dashboard
Unregister the theme options shuld be possible by overridable in the childthemes functions.php file.

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Wordpress (Divi): add category of post in sidebar widget

Site: ArboCityNet
I would like to add the category of the post in the sidebar widget (It's a widget, which shows me the latest/newest posts).
With the Plugin "what the file" I could see, what files are being used:
I googled, what I have to add: Wordpress wp_get_post_categories
But I'm not sure, where to change or add this phrase of code to show the category of the post in the sidebar.
Can someone help me with that problem?
Thanks a lot!
wp_get_post_categories() is a wordpress function you can add it to Functions.php file in your theme (This is coding thing create shortcode and then paste it to sidebar), But if you are Using Divi then there is pre-built widget available and you just need to Drag that on sidebar.
On wordpress admin panel Navigate to:
Apperance => Widgets
Screenshot: https://prnt.sc/vc02h4
And drag this widget to the sidebar with is running on the website.
Please let me know if it helps you!
Thanks

Why WordPress display menus automatically?

I have just installed WordPress 4.7 and I added some pages.
Then I can see page list in header.
I didn't create any menus in admin panel and why is it?
Do they add menus in header automatically if there is no menu?
I'd say in depends heavily on the theme you're using. If the theme has a feature such as a default menu generated form the entire list of published pages it might be the case.
In order to know which theme you are using, go into the admin then into the Appearance menu and the themes submenu.
If it is a custom theme you bought, you might have to refer to its documentation or go inside the code to check for yourself. If it is a default theme like twenty-sixteen you should be able to modify the behavior from the theme configuration in the admin.

In Wordpress, what is happening when we register support of a theme feature?

When creating a wordpress theme, you must enable certain theme features in your functions.php file. For example, enabling post thumbnails.
I'd like to know, in plain language, what is happening when we register support for post thumbnails in the functions.php file.
My understanding is this: the core of Wordpress has all the code for dealing with post thumbnails, including the UI for the metabox, how the uploaded image file is handled, etc.
In a theme, when we register support of the post thumbnails theme feature, we are telling the core of wordpress "our theme would like to use this capability of yours. Please let us access the functionality."
Do I have this basically correct?
Actually these are known as theme features, is a set of features defined by theme authors that allows a theme to register support of a certain feature (that is not active by default). Theme support functions should be called in the theme's functions.php file to work.
These are not activated in WordPress by default and these are
Sidebar Widgets
Navigation Menus
Post Formats
Post Thumbnails
Custom Backgrounds
Custom Headers
Automatic Feed Links
Editor Style
To register a theme feature you have to use add theme support function in your functions.php, it can also be called from a plugin if attached to a hook.

Appearance menu options in wordpress

I am new in word press theme designing. I have created a new theme, but in appearance menu it shows only
Themes
Widgets
Editor
Like the pre-built wp themes (twentyten and twentyelevan), I want all other menu options.
Themes
Widgets
Menus
Theme Options
Header
Background
Editor
I make search on google and found only about how to add menu option, but didnèt find the solution for other options. Please help me and tell me its solution.
Updated answer
for Custom Background: http://codex.wordpress.org/Custom_Backgrounds
you need to add theme supports
http://codex.wordpress.org/Function_Reference/add_theme_support
for widgets http://codex.wordpress.org/Function_Reference/register_sidebar
Actually play around with twentyten or twentyeleven and you'll see the codes in there.
most are in the functions.php, then sidebar.php
Happy Coding :)
Are you sure you're currently logged user is an Administrator?
if yes, maybe there are some codes in your functions.php, or other php files, or some plugins are disabling those options.
Canyou check if there are any codes like this
remove_submenu_page('themes.php', 'theme_options');
Reference:
http://codex.wordpress.org/Function_Reference/remove_submenu_page

Wordpress admin panel theme

I want to create customized theme for admin panel of wordpress.
googled a lot on this but didnt get any solution.
is there any way to customize the admin panel ( not just the css but the html layout also integrated with jquery )
I thought to show the admin panel on a page ( the selected menus and sections like add create post , manage comments ) but how to show them on a wordpress page ( created in theme )
Wordpress doesn't have Admin themes per se but you can change the look and feel of the admin panel by modifying the CSS or using a plugin. Have a look at this page from the Wordpress Codex:
http://codex.wordpress.org/Creating_Admin_Themes
Yes you can customize the admin-panel
Install 'Horizontal admin menu' plugin.
if you are frustrated with old look of admin panel then this will solve it to an extent.

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