I think this is made by researchers at Tufts University who use lego in the classroom. I am finding it a helpful guide on what the different official Lego “themes” are and what different robotics components and styles are available for each set. Again, not an official lego site, but it does use official lego sets.
New to using LEGO materials in your classroom? These resources should help you to get started.
If you need help choosing a kit, Which LEGO kit? gives brief descriptions of the kits and suggestions for their use.