I came to Linux as an winXP refugee, and I'd prefer not to get deeper into the nuts and bolts than I have to. I am fairly comfortable with the command line (I'm an old geezer who worked on several command line systems before windows were invented), so as long as it's documented, I can do it.
Synaptic gives a lot of options for updating, and frankly I find it confusing. So I just go to the terminal and do sudo apt-get update/upgrade from time to time.
What levels does that command line process install as default? Am I likely to run into problems picking up bleeding edge unstable versions? I use the programs that came with the package as far as possible, only adding things like python3 and a few low level utilities.