Theme Headers style.css

/**
 * Theme Name:  My theme (required)
 * Template:    The name of the parent theme. E.g. Twenty Seventeen
 * Description: A short description of the theme.
 *
 * Theme URI:   Subject URL. E.g. http://wordpress.org/themes/twenty
 * Author:      Kama
 * Author URI:  https://wp-kama.com
 *
 * Tags:        black, brown, orange
 * Text Domain: Subject translation domain. E.g. twentythirteen
 *
 * License:     License. E.g. GNU General Public License v2 or later
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 *
 * Version:     1.0
 */

.htaccess code

# BEGIN WordPress
# The directives (lines) between "BEGIN WordPress" and "END WordPress" are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Theme Files (include)

Theme Files (hierarchy) /themes/THEME/

A post template from any file:

<?php
/*
Template Name: My page template
Template Post Type: post, page, product
*/

// … template file code

Site Information bloginfo

Comment Loop

The Loop

<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
   <!-- Post output, loop functions: the_title(), etc. -->
<?php endwhile; else: ?>
	No posts.
<?php endif; ?>

<?php if ( have_posts() ){ while ( have_posts() ){ the_post(); ?>
	<!-- Post output, loop functions: the_title(), etc. -->
<?php } } else { ?>
	No posts.
<?php } ?>

<?php while ( have_posts() ){ the_post(); ?>
	<!-- Post output, loop functions: the_title(), etc. -->
<?php } ?>
<?php if ( ! have_posts() ){ ?>
	No posts.
<?php } ?>

<?php
global $post;

$myposts = get_posts([
	'numberposts' => 5,
	'offset'      => 1,
	'category'    => 1
]);

if( $myposts ){
	foreach( $myposts as $post ){
		setup_postdata( $post );
		?>
		<!-- Post output, loop functions: the_title(), etc. -->
		<?php
	}
} else {
	// No posts found
}

wp_reset_postdata(); // Reset $post
?>

<?php
global $post;

$query = new WP_Query( [
	'posts_per_page' => 5,
	'orderby'        => 'comment_count',
] );

if ( $query->have_posts() ) {
	while ( $query->have_posts() ) {
		$query->the_post();
		?>
		<!-- Post output, loop functions: the_title(), etc. -->
		<?php
	}
} else {
	// No posts found
}

wp_reset_postdata(); // Reset $post
?>

WP CLI

Core:

# Download WordPress
wp core download --locale=ru_RU

# Generate wp-config.php:
wp core config --dbname=NAME --dbuser=USER --dbpass=PASS --dbprefix=wp_

# Create DB (based on wp-config.php)
wp db create

# Install WP to created DB
wp core install --url=example.com --title=Example --admin_user=supervisor \
--admin_email=info@example.com --admin_password=strongpassword

Post:

# List posts:
wp post list

# Edit post:
wp post edit 1

# Post update:
wp post update 1 --post_title="Your New title..."

# Create posts:
wp post create --post_status=publish --post_title="Second Post" --edit

Post meta:

# See all metas of post 18:
wp post meta list 18

# Get post meta value:
wp post meta get 18 meta_name

# Delete post meta by key:
wp post meta delete 18 meta_name

DB:

# Create DB dump
wp db export - --add-drop-table --default-character-set=utf8mb4 | gzip > ./db-dump-$(date +%Y-%m-%d-%H%M%S).sql.gz

# Insert data from DB dump to DB
wp db import db_backup-2022-01-20.sql

# Login WordPress db:
wp db cli

# Run SQL Query:
wp db query "SELECT user_login, ID FROM wp_users;"

# Optimize db:
wp db optimize

Update:

# Update WordPress
wp core update

# Update all plugins:
wp plugin update --all

Themes & Plugins

# List plugins:
wp plugin list

# Search plugin:
wp plugin search yoast

# Install plugin:
wp plugin install yoast

# List installed themes:
wp theme list

# Install theme:
wp theme install twentyone

# Activate theme:
wp theme activate twentyone