[Koha] How do Koha package updates work?

Hello All, I have a Koha library for a personal collection and created the database in March 2019 starting with, I believe, 18.5. I am not much of a tech person but I was able to set up my library on Debian with Digital Ocean and did the installation with packages. Since then, it has updated to 18.11.03. I was curious if someone could direct me to information about how the updates work and the timing of them in relation to new releases and/or if I need to be facilitating the updates manually. Any information that could be shared would be appreciated. Thank you for your help! best regards, Dawson Weber Los Angeles