I am a web developer as my main income currently. I started in the 90s with basic html, now mainly in either .NET or PHP. I do custom sites, all database driven.
Website development has come a long way since the early days, but in the end it all produces an html page, which for a small site you can equally handcraft.
I used to use Dreamweaver way way back - essentially a specialised text editor with built-in knowledge of tags. I don't know of any modern, up to date page builders that would do what you are looking for (although I haven't specifially looked). All the packages I was aware of either are dead or fossilised from years ago.
My issue with using software like Serif above (with no disrespect) is that modern html has moved on a long way, and what they produce can look very dated, and with no support for modern devices (phones, tablets), and no knowledge of modern html tags.
My recommendation would be to use a good code editor like VSCodium (Microsoft's VSCode without the telemetry), previewing your results locally in Firefox (or other browser). Its easy to make changes, save, preview.
There are plentiful online tutorials for all aspects of learning html, how to structure your pages, everything, but to modern standards.
The other aspect is you need to learn both HTML, and CSS, which is the styling language governing how everything looks. The basics can be picked up easily, again with so many online tutorials.
A tool I use all the time is the Web Developer Tools extension in Firefox. You can load your webpage, open web developer, and write your CSS live, seeing changes as you go. Then copy the code down into your local file to upload. You can also examine any webpage to see how they did something.
It might be worth trying out online tools like Codepen (https://codepen.io/). This is an online editor, your html in one window, css in another (and javascript too if you are so inclined), with a live preview section, or you can have the fullscreen preview open in a second tab. Once you're happy with something, copy it to your local file then upload, and you can delete the codepen.
So, not the kind of builder tool you are looking for, but I argue that investing time this way would be well spent.
Best wishes!