system updates

[Will Senn <will.senn%gmail.com@localhost>]

    Hi,
      
      NetBSD newb here. I know FreeBSD well, a bit about OpenBSD, and
      lots about Linux. My question is after installing, how do I check
      for updates to the system itself and get them installed (security
      updates, kernel updates, etc)... or is this not a thing with
      NetBSD? I figure packages are updatable via the pkg management
      tools (pkg_add/pkgsrc) doing my research on this as we speak.
      
      Help appreciated and if there's a common set of procedures folks
      follow, that'd be good to know, too... in freebsd: freebsd_update
      fetch install for system updates, pkg update && pkg
      upgrade for packages and mint: apt update && apt upgrade
      for the same sorts of updates... that kind of thing.
      
      Thanks,
      
      Will