Will Sccm Install Superseded Updates?

Superseded Updates could be deployed to client in sccm.

Can superseded updates be installed?

Generally if you have superseded updates in your deployment you will see in the log files during execution that they are superseded and will not be installed, but in some cases some of them do install.

Can you skip SCCM updates?

You can skip the previous SCCM 1902 hotfixes and directly install SCCM 1906 update. If you have already installed the above hotfixes, proceed with installing SCCM 1906.