here is an interactive map by Quanta Magazine on the state-of-the-art of theoretical physics and its unsolved problems

amazing animation by Douglas Arnold and Jonathan Rogness showing how the four basic two-dimensional motions (translations, rotations, dilations and inversions) can be easily understood as the motion of a sphere in a three-dimensional space

very pedagogical and entertaining Youtube channel by Brady Haran about numbers and some other topics in math and physics