Lightweight sites would suffice. Generally, just google.com or Wikipedia.
Google is actually very heavy and it's one of
the cancers that's contributing to making the modern internet so heavy in the first place, with its tentacles in the code of most websites that on the surface seem to bear no affiliation to Google. Google also most likely uses encryption protocols that your Mac Plus has no idea about, and the pages just give you an error message.
FrogFind is the closest thing to Google you can have. It allows you to search the internet and enter websites by parsing just the plain text and removing all the clutter. But it's completely random which sites it works with, and to what degree. When it displays a page, it gets rid of all the page's styling, so if the page has lots of information all over the place, getting it displayed to you in plain text might end up into a really unhelpful mess of information because you can't tell what's the content of an article, what's a caption, and what's something else. That's actually not too far from how a blind person has to surf the net: some pages are better designed with accessibility in mind, when it comes to navigating the text and differentiating between different types of information on the pages.
For full listing of available pages to try, see
this post.
Wikipedia can be accessed via the
Old Net.
Back in the day when we had a Macintosh Performa, we got an internet service for it. We let it go very soon because it was just unusably slow to load anything.
I'm planning to install the MacWWW. What external cables would I need to transfer MacWWW download from my PC to a vintage macintosh?
If I had to guess, it might be easier to find a 3.5" USB floppy drive for your modern PC, than cables. But whether a System 6 accepts files that have gone through a PC, I don't know. It depends on whether the files actually get there without the PC modifying them. If not that, I think it might even be more likely to be able to transfer files over the local network, than directly with a cable from Mac Plus to a PC. Their connection protocols are just so very far out.
Maybe MacintoshGarden or MacintoshRepository have a guide on this, they're the dealers of old Mac software after all.
