I have two general questions how to show updates content and how to make partial update for example I want to update only nginx and don't touch other environment.
The more traditional way to show upgrades without running them is
Another useful tool is
As with SvW's post, run
To display list of available upgrades:
will list the changelog, if available.
To upgrade just one package:
will install or upgrade just this package.
Note however that this might fail if an update is dependent on other updated packages.