Hi, Salim, welcome to LQ and welcome to Linux.
There isn't a Linux "company" as such. There are literally hundreds of Linux distributions, many of them put together by companies along with many others put together by groups of interested individuals or even by one person working alone. You submitted your post to LQ's Newbie forum; a little down the list of Forums you'll find Distributions and, within that, sub forums for quite a few distinct "flavors" of Linux (the "flavor" is an individual distribution, such as Linux from Scratch, Slackware, Debian and many others). The distributions include, pretty much, the same software -- the programs you actually use -- plus, in many cases, customized software to satisfy some particular philosophy or purpose of the individual developers of a given distribution.
The great thing about Linux is that you can easily try out different distributions (for no or low cost) and decide which one fits your needs and your way of doing things. There are two choices down the right-hand side of the LQ menu, Distro Reviews and Downloads where you can find a great deal of information and opinion about different Linux distributions and, when one tickles your fancy, a place to download the software so you can try it out. Pretty neat, eh?
Beyond the software provided with the various distributions there are thousands of applications you can download and install in a Linux system -- that might even be hundreds of thousands -- and most of them are available at no cost.
And, the best thing about LQ? You can get the help of a large number of people with any problems you may have, all you have to do is ask.
So, read a few things, try a few things, read about how to do things and ask questions when you need help.
Mostly, have fun.
Hope this helps some.