What's the biggest docker footgun you've experienced?
I'll start:
When I was first learning to use Docker, I didn't realize that most tutorials that include a database don't configure the database to persist. Imagine my surprise when I couldn't figure out why the database kept getting wiped!
Using Docker Desktop at work without a license. Use Rancher Desktop instead. It's essentially like what Oracle did with the Oracle JDK. To my knowledge they haven't gone after anyone but it is technically a license violation to use it for work without a license. I could not (easily) find a way to install Docker on Mac without using Docker Desktop but Rancher Desktop worked fine.
Also, podman exists as a drop in replacement for Docker for the curious. I haven't tried it myself though so this isn't a recommendation.
I can vouch for podman. It can run daemonless and rootless, symlinks to docker.sock and the ui works with both kubernetes (kind & minikube) and most of the docker desktop extensions.
Podman is great and now is compatible with the docker engine. Having rootless containers by default is awesome! There's also a utility called podman-compose that I also highly recommend.
Interesting — coming from the Linux world where docker is an 'apt install' away, I struggled with docker installation on Mac and settled on their client because of various “gotchas” I saw online. And even then got pissed because the client overwrote my local 'kubectl' bin.
Podman is just as easy to install--admittedly they give way more support for Ubuntu and Fedora than other platforms (unfortunately). But once you've switched, you won't go back; it really is a 'seemless' transition, and you can use the same dockerfiles and docker-compose files with it.