Very helpful command it was for those, whose modem had to be rebooted daily back in the day: Have a cron-job open the tray, which in turn was placed strategically so that it would hit the reset button of the modem, then close the tray. And voilà; automatic reboot of the modem. Robotics at its finest!

Apart from fzf that helps me find recently used commands and also files and directories easily, I also use tldr that gives you a simple cheat sheet for every command and very often saves you trawling through endless man pages.