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Not long ago I made my first Magento 2 custom/child theme so that my website changes won't be erased when I upgrade to another version.

I now want to override some core Magento 2 files that I need to make changes in.

The official theme document on Magento's website makes no sense to me.

For days I have looked at many different guides on how to override the core Magento 2 files, but I can't seem to wrap my mind around where I should place the copied files in my theme folders so that I can modify them. Two of the files (default.xml) have the same name but have different content.

This is pretty much the only thing I have done so far, because of my ignorance and confusion: I placed a modified default.xml file to customize the footer links in the /Magento_Theme/layout folder of my theme, but when I enable my theme, the links at the top and bottom of the homepage turned light blue, and the mini cart doesn't display any items that are in the cart, and wouldn't let me "Proceed to Checkout" when pressing that button.

Obviously, there is something that I am missing.

Am I only supposed to copy files from the /vendor/magento/theme-frontend-blank folder, or the /pub/static/frontend/Magento/blank/en_US folder?

Does anyone know of a good newbie/dummy guide to theming in Magento 2, or can just tell me what I am missing?

Thanks.


I am using Magento 2.2.1

My custom/child theme is inheriting from the Blank theme.

This is my theme structure: /app/design/frontend/ABC/ABC_Theme/, then inside that folder are etc, Magento_Theme, media, web, composer.json, registration.php, and theme.xml.


Below are the files that I need to put in my theme folders and modify them, and what I want to do with them:

To change the Captcha noise level: /vendor/magento/zendframework1/library/Zend/Captcha/image.php

To change the text for the captcha from "Please type the letters below": /vendor/magento/module-captcha/view/frontend/templates/default.phtml

To change some of the words in the notice: /vendor/magento/module-theme/view/frontend/templates/html/notices.phtml

To change "What's on your mind", and "Jot us a note and we'll get back to you as quickly as possible" in the contact us page: public_html/vendor/magento/module-contact/view/frontend/templates/form.phtml

To remove the "Orders and Returns" link from the footer, and to remove the sales-guest-form-link: /vendor/magento/module-sales/view/frontend/layout/default.xml

To customize the popup's text: /vendor/magento/module-customer/view/frontend/web/template/authentication- popup.html

or should it be from

/pub/static/frontend/Magento/blank/en_US/Magento_Customer/template/authentication-popup.html

To customize the links in the footer: /vendor/magento/module-checkout/view/frontend/layout/default.xml

Should all of these files go somewhere in the 'Magento_Theme' folder or folders of their own?

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