I’ve been doing Linux server administration for 20 years now. You’ll always have to duckduckgo things. You’ll never keep it all in your head, even just a single server with a handful of services. Docker and containers really isn’t too hard. Just start small and build from there. If you can learn how the https://linux.die.net/man/1/chroot command works, you’ve pretty much learned docker. It’s just chroot with more features.