if u mean by that snap and the like ?
I mean tools like apt, yum, dnf, emerge, and pacman, the things you use to install additional software packages onto your system.
It sounds like you're on the right track. There are differences in how you need to think about Linux administration, but once you get your head around that and some shell familiarity you should be set.
I can offer some assistance on the docker part; look me up on IRC if interested - irc.libera.chat #gentoo-chat (Aussie time though)