As the title says, how can one find Docker's version?
For the daemon's version (meaning the engine's version) that's running on your server:
$ dockerd --version Docker version 20.10.2, build 8891c58
For your client's version that's running on your local computer and with which you send commands to the daemon on the remote server:
$ docker --version Docker version 19.03.13, build 4484c46d9d