I'm an expert in some things, beginner in others. I've done a few conference talks, and on topics where I'm an enthusiast, I've always made sure to title/label

I'm an expert in some things, beginner in others. I've done a few conference talks, and on topics where I'm an enthusiast, I've always made sure to title/label as "intro to ... foo" or "foo 101". The last thing I've wanted to do was to make someone feel they wasted their time at my talk, precisely because I've felt that way about so many others over the years.