Think You Can’t Dance? Online tutorials for TikTok and music-video routines can help prove you wrong. The “WAP” dance is within your reach. Credit...A&M Records Feb. 27, 2021 In the early days of the pandemic, a strutting, hip-shaking dance trend took over social media: the J. Lo TikTok Challenge, a roughly 30-second piece of choreography from Jennifer Lopez’s Super Bowl halftime performance last year. It was hard to watch the routine and not want to learn it; in video after video, the energy was contagious. But where was a novice to begin? A quick internet search for “Learn J. Lo TikTok challenge” would send you into another vortex: the vast, uneven world of online dance tutorials.