Assembly tool for whole genome and tool for unzip gz file

I need to know the assembly tool in Galaxy for the whole genome that I should use for my fastq file, and the tool for unzip the file because my fastq file is gz file

No one would be able to give you an specific answer. There are different ways to do an assembly, reference based (mapping and consensus, not always called “assembly” I know) or denovo for example. And each method has many different tools that you can use, all with their own specialty. Maybe you can check out this page as a start Galaxy Training!

In the tool menu you can scroll to the assembly section to see some tools.

What kind of data do you have, like sequencing technique? Which organism?