Just throwing out the idea...

We have lots of examples in the gallery. Some of them are beginner oriented like #15706, and some are much more advanced, like the ones proposed in #14300. It can be overwhelming for newcomers who don't necessarily know what they're looking at.

How would you feel about adding tags, e.g. "Beginner", "Advanced", "New in 0.XX" etc.? I'm picturing these as labels e.g. on the rendered image in the gallery, but we could also use them for filtering?

I guess this is not just scikit-learn related but also a sphinx-gallery feature, I'm just testing the water here first