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I'm pretty new to Magento in general and just started working with Magento 2.

Here is my question - How to show prices for all out of stock products?

There is this topic: Magento 2 : How To Show Price of "out of stock" Products

And apparently it works, but half of the instructions don't make sense to me.
After creating custom module, what should I do with it? Should I change anything else anywhere?

Thanks!

You need to create your custom module using below code

Let say module name Custom_Outofstock

So create folder in app/code

Create registration.php file at app/code/Custom/Outofstock/registration.php

Add below code to it:

<?php



MagentoFrameworkComponentComponentRegistrar::register(

    MagentoFrameworkComponentComponentRegistrar::MODULE,

    'Custom_Outofstock',

    __DIR__

);

Create module.xml at app/code/Custom/Outofstock/etc/module.xml

Add below code to it:

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">

    <module name="Custom_Outofstock" setup_version="2.0.0">

    </module>

</config>

Now create file suggested in this
answer given By Sohel Rana as below

Create di.xml at app/code/Custom/Outofstock/etc/di.xml

Add below code to it:

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <preference for="MagentoCatalogPricingRenderFinalPriceBox" type="CustomOutofstockPricingRenderFinalPriceBox" />

</config>

Create Price render file FinalPriceBox.php at app/code/Custom/Outofstock/Pricing/Render/FinalPriceBox.php

Add below code to it:

<?php

namespace CustomOutofstockPricingRender;



use MagentoMsrpPricingPriceMsrpPrice;

use MagentoFrameworkPricingRenderPriceBox as BasePriceBox;



class FinalPriceBox extends MagentoCatalogPricingRenderFinalPriceBox

{

    protected function _toHtml()

    {

        $result = parent::_toHtml();



        if(!$result) {

            $result = BasePriceBox::_toHtml();

            try {

                /** @var MsrpPrice $msrpPriceType */

                $msrpPriceType = $this->getSaleableItem()->getPriceInfo()->getPrice('msrp_price');

            } catch (InvalidArgumentException $e) {

                $this->_logger->critical($e);

                return $this->wrapResult($result);

            }



            //Renders MSRP in case it is enabled

            $product = $this->getSaleableItem();

            if ($msrpPriceType->canApplyMsrp($product) && $msrpPriceType->isMinimalPriceLessMsrp($product)) {

                /** @var BasePriceBox $msrpBlock */

                $msrpBlock = $this->rendererPool->createPriceRender(

                    MsrpPrice::PRICE_CODE,

                    $this->getSaleableItem(),

                    [

                        'real_price_html' => $result,

                        'zone' => $this->getZone(),

                    ]

                );

                $result = $msrpBlock->toHtml();

            }



            return $this->wrapResult($result);

        }



        return $result;

    }

}

Now run below command to enable module:

php bin/magento setup:upgrade

Flush cache using below command:

php bin/magento cache:flush