Magento2

Add the following line to your CSS file:

.opc-summary-wrapper{

    display:none;

}

Goto following directory

vendor/magento/module-checkout/view/frontend/web/js/model

And open the file step-navigator.js

Copy this file to your working theme directory.

Edit the function getActiveItemIndex in step-navigator.js You will get 0,1 etc when console.log(activeIndex);

In Magento 2, a lot work has been done in improving the response time and Sections are a part of it. Magento sets customer related data in local storage of browser in key value pair. Each key is known as section. In this post we will what sections we can update 

We can use all below sections in system.xml file 

go to this file

/Magento/Framework/View/Element/Template/File/Validator.php

replace this part

foreach ($directories as $directory) {
    if (0 === strpos($realPath, $directory)) {

with the following one:

$isWin = 'WIN' === strtoupper(substr(PHP_OS, 0, 3)); 

/** @var bool $isWin */ 
foreach ($directories as $directory) { 
    if (0 === strpos($realPath, !$isWin ? $directory : $this->fileDriver->getRealPath($directory)) ) {

Original article 

How to Add Admin User via Command Line

php bin/magento admin:user:create --admin-user=wikicode  --admin-password=WiKiLoveMagento [email protected] --admin-firstname=Wiki  --admin-lastname=Code

the best way to do do this is using the below method

$objectManager =   \Magento\Framework\App\ObjectManager::getInstance();
$productR =      $objectManager ->create('\Magento\Catalog\Api\ProductRepositoryInterface');
$product = $productR->get('product_sku');
$product->cleanCache();
$this->_eventManager->dispatch('clean_cache_by_tags', ['object' => $product]);

you need of course to follow the DI to implement this code, I just used this quick way to make it easy to understand

Using Object Manager

$storeManager = $objectManager->get('\Magento\Store\Model\StoreManagerInterface');
$websiteId = $storeManager->getStore()->getWebsiteId();
 
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$customerRepository = $objectManager->create('Magento\Customer\Api\CustomerRepositoryInterface');
 
// load customer info by email
$customer = $customerRepository->get('[email protected]', $websiteId);
 
// load customer info by id    
$customer = $customerRepository->getById(1);
 
// Update customer Info
$cust

use this query to see  all products that do not have images in magento2

SELECT sku FROM `catalog_product_entity` WHERE `entity_id` not in (SELECT `entity_id` FROM `catalog_product_entity_media_gallery_value` )

ignoring the "Not Visible Individually" products

you have to add this code to the block or to the page

 {{block class="Magento\Framework\View\Element\Template"  template="{Vendor}_{Module}::pages/example.phtml"}}

Example 

{{block class="Magento\Catalog\Block\Product\ListProduct" category_id="50" name="home.products.list.custom" template="Magento_Catalog::product/list.phtml"}} 

{{widget type="Magento\Catalog\Block\Category\Widget\Link" anchor_text="MY Custom category" title="Custom Category" template="category/widget/link/link_block.phtml" id_path="category/12"}}

there are three templates

Magento profiler can help you with the store performance tuning before the store release or during the exploitation.
The old UI for enabling/disabling the profiler is not available in Magento 2 and the profiler is disabled by default.
To enable one of the profiler formats mentioned above, you can edit .htaccess (a configuration file for Apache Web Server software):

    Choose one of the next expressions: