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What do you mean by an action hook?
In WordPress an Action hook is a TYPE of hook which is mainly triggered at a specific time when WordPress is running and which lets you take an action. And this will have DIFFERENT things LIKE creating a WIDGET when WordPress is initializing or sending a Tweet when SOMEONE publishes a post.

What is DEFAULT table PREFIX in WORDPRESS?
wp_ is default prefix for WordPress.

How can we enable debug MODE in WP?
To enable debug mode in WP we need to edit wp-config.php FILE. And we need to change WP_DEBUG CONSTANT value to TRUE in this file.

What is the minimum requirement to run WordPress?
Below are the four main requirement to run WordPress
(1)PHP 7 or greater
(2)MySQL 5.6 or greater Or MariaDB 10.0 or greater
(3)HTTPS support(Recommended)
(4)The mod_rewrite APACHE MODULE

Where do we stored WORDPRESS CONTENT?
WordPress contents are BASICALLY stored in MYSQL database on server.

In which YEAR WORDPRESS RELEASED?
Wordpress released in year 2003 FIRSTLY.

What do you think website on WordPress is safe and secure?
Froom mypoint of VIEW it is safe and secure to operate. And we will not worry about that. But one thing that need to be TAKE care is that update our site and the latest wordpress version TIME to time to AVOID hacking.

How many default tables are in WordPress and there NAME?
There are 11 tables by default in WordPress and there names are given below.
(1)wp_options
(2)wp_users
(3)wp_links
(4)wp_commentmeta
(5)wp_term_relationships
(6)wp_postmeta
(7)wp_posts
(8)wp_term_taxonomy
(9)wp_usermeta
(10)wp_terms
(11)wp_comments

Basic steps to install WordPress on your system?
Below are the different steps to install wordpress on our system
(1)Download and unzip the LATEST WordPress from official WEBSITE.
(2)Create a database for WordPress
(3)Find and rename file wp-config-sample.php to wp-config.php
(4)Then ADD your database information there.
(5)Upload the WordPress files on to web server
(6)Now Run the URL in browser
(7)Now NEED to set the basic informations like site title, username and password after that you can use this.

Five steps to disable user comments in WordPress?
Below are the five steps to disable comments in WordPress
(1)In STEP 1 we will login in our WordPress admin panel.
(2)In SECOND step we will go to settings menu.
(3)In third step in Settings menu click on discussion.
(4)In FOURTH step we will uncheck Allow people to POST comments on new articles. checkbox
(5)In last final step we will click on save changes button and task is DONE now.

Four main limitation for WordPress website?
WordPress is MAINLY used for e-commerce sites, membership sites and for Photo galleries types sites. Below are the main limitation for WordPress website:-
(1)When we need to add several plugins that make website heavy to load and run.
(2)For some modifications or change in wordpress website we must have the knowledge of PHP.
(3)Formatting and MODIFICATION of graphic images and tables are DIFFICULT to handle in wordpress.
(4)One of the main limitation is that we need to update website and version of wordpress time-to time for browsers and mobile devies. Updating WordPress version leads to LOSS of data, so a backup copy of the website is required.

Time when Wordpress released and announced as open source SOFTWARE?
(1)WordPress was first initially released on 27TH May 2003
(2)Wordpress was first released by Matt Mullenweg and Mike LITTLE.
(3)WordPress was announced in October 2009 as open source

Latest version of WORDPRESS?
The latest version of wordpress is 5.2 BETA 1 and that released on April 12, 2019.