If you are talking about installing software from *.tar.gz files, you will need to learn about compiling from sources
. It's really not all that complicated, unless you must resolve lots of dependencies
You would do better, though, to get your software from the Ubuntu repositories
(your user agent icon says "Ubuntu," but, if you are using a Ubuntu derivative, this also applies). Generally, in most Linux distributions, you don't download random files from websites and install programs; you install the programs from the repositories (commonly referred to as "repos"). The files in the repos have been vetted and tested. In addition, most package managers (programs are referred to as "packages" and the programs you use to install and remove them are "package managers") resolve any dependencies automagically.
gives a good explanation of repos and how they work.
And welcome to LQ.