You mean **GUI** I assume.
Depending on your distro, you have somewhere in the menus an entry which is "install software", "add/remove program" or something similar. This is a front end to the RPM/YUM commands.
Quote:
how do i know which service is needed or not needed to install in Linux?
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If you are referring to dependencies, then the package manager handles this automatically.
More generally, if you are uncertain whether or why you need something, then you probably don't need it!!