What is Trello? And how to use it (opens in new tab)

I once tried to manage a social media content calendar using Post-its on my office wall. It was perfectly color-coordinated and laid out week by week. Then #ThrowbackTuesdays stopped performing (fair), I couldn't create the content we needed for #MotivationMondays fast enough, and after a few rounds of rearranging, the Post-its stopped being sticky. So I pivoted. I still needed something visual, where I could see the whole plan at a glance, and could rearrange on the fly. It just needed not to