I understand now. I misunderstood you at first - I thought that you didn’t have a problem with the code but only with ideas about styling. If it seems too advanced though, I definitely think you should spend some time to just get the foundations of basic HTML and CSS down and then move on to understanding the basics of bootstrap, before you even start with the page. In your case, I think that looking at the code is probably good. However, you need to make sure that you understand why the code is the way it is, instead of just copying it.
Here is a playlist about basic HTML and CSS foundations. I haven’t watched this myself but I think it will be helpful, because I have found other tutorials from this same content creator to be very helpful.
This website I have found very helpful as a reference for many of my beginner questions.
When you feel more confident with your HTML and CSS, these videos about the foundations of responsive design with Bootstrap will also be of great help to get you started on a good-looking portfolio. These helped me a great deal.
Before I started, I googled “how to create a single-scroll webpage” and found many results. This is the one I got my information from, although I encourage you to look at the other results as well.
Lastly, don’t be discouraged if the project seems impossible and there is too much information you need. It can be rough not even knowing what kind of information you need - but the best place is to start at the bottom. As you go along, create small things with what you know already, and start to think creatively about what you could change about those basics to achieve different results. Keep your projects simple, but do give yourself small challenges. Also google the meaning of English words if you are unsure about their meaning, that may help you too
With most of the challenges, I have to do lots of extra research and reading before I start.
By the way, Bootstrap is not the only responsive framework out there. However it is the one I have used and am familiar with, which is why I’m recommending it to you.