You should open a new help thread on each separate issue. Please provide far more details on each separate help request.
Lumping unrelated issues together not only leads to confusion, but it makes it difficult to find information when it is all jumbled together.
In the future please open a separate thread for each issue makes it far easier for newcomers to the distro to find the information they are looking for.
I would assume that means that your ISO had errors on it if it failed its checksum.
I'm not sure though, as I'm not familiar with Etcher usage. It has a little too much telemetry in it for my liking. I generally use Suse ImageWriter or the dd command.