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What are Hooks in WordPress? Define different types of hooks in WordPress ?

Hooks are functions that can be applied to a Filter or an Action in WordPress and they allow you to, with modifying areas in a theme or plugin without modifying the original file. Depending on whether you apply them to a Filter or to an Action, they are called action hooks and filter hooks.
Hooks enable users to create WordPress themes or plug-ins with short code without changing the original files. There are two types of hooks:
Action hooks: Action hooks facilitate you to insert an additional code from an outside resource. An Action hook in WordPress is a hook that is triggered at a specific time when WordPress is running and lets you take an action. This can include things like creating a widget when WordPress is initializing or sending a Tweet when someone publishes a post.
Filter hooks: Filter hooks facilitate you to add content or text at the end of the post. A Filter hook in WordPress allows you get and modify WordPress data before it is sent to the database or the browser. Some examples of filters would include customizing how excerpts are displayed or adding some custom code to the end of a blog post or headings.

What is user meta function in WordPress?

The user meta function is used to retrieve the metadata of users. It can return a single value or an array of metadata.
Syntax: get_user_meta( int $user_id, string $key = ”, bool $single = false )
User id is the required user id parameter Key is the optional parameter which is the meta key to retrieve. By default, it returns data for all key values. Single is an optional parameter that tells whether the single value will return. By default, it is false.

Function to get website url in WordPress?

get_site_url(); function is used to get website url in WordPress.

List some action and filter hooks functions in WordPress?

Below is list of some Filter hooks functions:
has_filter()
add_filter()
apply_filters()
apply_filters_ref_array()
current_filter()
remove_filter()
remove_all_filters()
doing_filter()
 
Below is list of some Action hooks functions:
has_action()
add_action()
do_action()
do_action_ref_array()
did_action()
remove_action()
remove_all_actions()
doing_action()

Mention the rules to be followed while developing the WordPress Plugin?

While developing a WordPress Plugin, the following rules should be followed step by step:
Create a unique name.
Create the folder of Plugin.
Create a sub-folder for PHP files, translations, and assets.
Create the main plug-in file and fill up the header information.
Create activation and de-activation functions.
Create an uninstall script.
Create a readme.txt file.
In case of detecting the paths to plug-in file, use proper functions and constants.

What are the template tags in WordPress? List some of them.

In WordPress template tags are PHP functions that are used to display information dynamically or customize blog template. Below are the list of some generally used template tags in WordPress
get_header()
wp_register()
get_sidebar()
wp_title()
wp_enqueue_script()
get_the_author()
wp_list_authors()
category_description()
get_bookmarks()

How Can I Develop a WordPress Plugin?

Here are the basic steps:
You need to come up with a unique name, create the plugin folder with a sub folder for PHP files, create the main plugin file, create functions for activation and deactivation, create an uninstall script and readme.txt file.

How to run database Query Function on WordPress?

WordPress’s query function allows you to execute any SQL query on the WordPress database. It is best used when there is a need for specific, custom, or otherwise complex SQL queries. For more basic queries, such as selecting information from a table, see the other wpdb functions above such as get_results, get_var, get_row or get_col.
Syntax
<?php $wpdb->query(‘query’); ?>

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