Hooks/Filters

too many to list here.

Any thing specific?

• Remove “Add to Quote Request List” button from “Related Products” on product pages like: https://www.karaymetals.com/precision-metal-tubing-catalog/a513-dom-tubing-mechanical-steel-tubes
• Change “Product Added To Quote List” on https://www.karaymetals.com/cart
• Change textarea style and placeholder text in checkout page here: https://www.karaymetals.com/checkout

Any hook to hide “Add to Quote Request List” button from “Related Products” on product pages?

So, any hook to remove the Request Quote buttons under Related products thumbs in individual product pages? Or change the label?

“So, any hook to remove the Request Quote buttons under Related products thumbs in individual product pages?”
You can’t use hooks there. Fot that type of thing you can use css in your theme.
you can add the following to your css in your theme.

.related .rfq_button{
    display: none !important;
}

thanks