Unless it's a well defined technical solution or a very deep and narrow (well defined) topic, I've always found "the answer" to be spread across multiple webpages/sites/sources. To tackle this:

1. I have a coarse hierarchy of topic names as a directory tree

2. These directories have mostly text files in them but can also have PDF etc

3. Text files contain my summary/"the answer" followed by the relevant extract from webpage (citation). There usually are multiple such citations

4. Since I mainly deal with a lot of textual context, I have mostly text files but there are situations where I need spreadsheets/pictures/video - in those cases, I save the webpages as PDF but maintain a parallel version of #3 with notes to refer to the native format when spreadsheets/pictures/video need to be involved