Welcome to StackExchange. As mentioned on comments by @aravona and @Rup it will be harder to give you a good answer without more context.
In any case, I think you have a couple basic approaches to achieve what you want: using WordPress template_redirect hook or .htaccess rules.
The most performant would be htaccess, but it would be more prone to redirect ...
From there you either have to add existing WooCommerce classes to your BootStrap CSS or add BootStrap classes to your WooCommerce templates (preferred/recommended).
As for the templates, it really depends on ...
Try editing in the 'text' editor and adding on the empty lines and see if that gets stripped out.
Here's a screen capture, yeah it gets stripped out because of WordPress' default formatting (wpautop), but it still registers what was intended. Here's the text:
Now here's the end result on the front end:
There must be something stripping ...
In my experience with woocommerce, there are two ways.
1 - Add some extra css to your current theme.
For example I want to modify the title of the product :
I open the chrome inspector, I see that the product page has a class css for body.single-product.
The product container has a class css div.product (create by woocommerce itself <div id = "...
Yo don't properly call the callback function.
If you want to code on oriented object programmation, you have to create your class, and construct function with add_action...
Here more informations about it :
or you do something like this (its no POO but its working as well).