A lot of times I remember pieces of content but don't not the title of the article, making it hard to find something I'm looking for. Also some of the sites just disappear after some time.
"SingleFile is a Web Extension (and a CLI tool) compatible with Chrome, Firefox (Desktop and Mobile), Microsoft Edge, Vivaldi, Brave, Waterfox, Yandex browser, and Opera. It helps you to save a complete web page into a single HTML file."
I really like and often use the option to highlight text and add notes to a web page before saving it locally. After saving the file you can easily do a full-text search because, e.g., both macOS Finder and Windows Explorer index HTML files by default.
A couple years ago I discovered Bookstack's [0] editor was capable to keep the most of the formatting for the Word documents and most of the sane pages, looks like it still works [1][2]
It didn't manage to save the whole old.reddit.com page, but I tried this on a official demo, of course it could be just limited resources.
And of course there is Evernote [3]
[0] https://www.bookstackapp.com/
[1] https://imgur.com/a/VYvaqnl
It currently supports webpages, pdfs, personal notes, images and twitter.