I think it's a great project to learn and contribute. The scope is very broad, so there are plenty of different areas to contribute to, including not-so-advanced functionality. For example, the initial find-in-page feature was introduced just a few week ago[1] and the core logic relatively simple.

Plus, the build process is well documented and works out of the box (at least on Ubuntu in my experience) and the community is nice and welcoming.

[1]https://github.com/SerenityOS/serenity/pull/24480