Thank you Basara, I'll try it. have to find where to put it first. That's my main problem. I can insert certain things through the html blocks, but other codes I need to get into the root files. Finding the right ones is the issue. I use the page source panel in win. but it's a bit confusing trying to find the exact script page.
LOL, it's not like the days when working in wordpress with "type this using this code and get Hello World" in html and some PHP, then you made a simple web page.

Ok, so I went into storefront/view/default/stylesheet for bootstrap5 theme and went into style css tried a few test colors in a few areas and nothing changed.
If I go to public/extensions/bootstrap5/storefront/view/bootstrap5/css/style.css same issue.
This is the problem I have, so many areas and not knowing the right one to get into to make changes, or do all these areas lead to the same style.css?

Well, still can't find where to change the black strip in the header.

Hi all! I wanted to change the menu bar color (and other layout colors) and can't find the proper place to do it. I'm using the bootstrap theme. Is /storefront/view/default/stylesheet/bootstrap.css the right place?
I'm old. but the mind is still willing. A lot has changed since I made html web pages 25 years ago. Thanks for any help

In the products/options where you can choose file etc. so customers can upload image or text for personalized items, I would like to know where the codes are for those inputs to tweek if I can.
Also, if a customer can upload images, what is the path where the images are stored on the server to delete them after a certain amount of time passes so as not to keep them on the server forever?
Thank you for reaching out, I appreciate it and love this ecommerce program!