Thank you for taking the time to have a look, and to comment - I appreciate that.
strong does seem to work OK for me - on Chrome on my Windows PC and on Safaria and Firefox on my Mac, but I take your point - I hadn’t considered selecting more than a single font weight. I’ll certainly try that and see how it looks.
As an aside, posting this publicly made me reconsider my page. I’ve been working through the content and making sure to pass all of the tests. I also validated my page with the W3C Markup and CSS online validators as well as checking it with Koa11y. However, having now put it in the public domain - I realise that it’s not really going to wow anyone who looks at it.
I guess it’s an individual choice that we have to make - how much time to spend simply to get the qualification and how much to try to make something truly exciting and appealing that might stand up well as part of a body of work. I think I must strive to try to make something a bit more appealing and creative for the future!