gregor160300

My advise is to just install a simple distro first like ubuntu or mint (maybe dualboot) then watch some youtube videos on basic tasks, but there is no better learning then by experience so my advise is just use it a lot and if you dont know something search on the web or ask on fora

For maximum usability: Ubuntu or one of its various flavors (Lubuntu, Kubuntu, etc); Linux Mint; probably openSUSE and/or Fedora, too.  All have quite a bit of tweakability (Ubuntu is a bit less apt to just tell you "hey you can change all this stuff," largely because it aims to be very easy to use for non-tech savvy people, but all the options are still there), and will generally have very good performance despite being some of the heaviest Linux distros out there.  Ubuntu might be the most resource intensive, largely because of its Unity desktop environment, but even then it's usually no worse than Windows on a machine from the past few years.
 
For maximum tweakability: Arch, Gentoo (and its descendants, like Sabayon).  Arch is extremely popular, and not only lets but makes you tweak almost everything about your system.  You typically get very minimal installations--you have to manually install your graphical user interface, for instance--which are super fast, minimally bloated (though like all systems, they will accrue bloat over time if you're not careful), but require you to do a lot of work compared to other distros to get them up and running.  Gentoo is probably the most tweak-oriented distro out there, since you compile the whole OS from source code (and almost all of its software packages, too).  The upside of this is you can change absolutely everything about how absolutely anything works, which makes Gentoo a hands-down best choice if you have some very specific need that other distros don't fill.  You also might get better performance for natively-compiled programs compared with binary installs (usually by a pretty slim margin, if at all), but you have to spend more time compiling things.
 
Both Gentoo and Arch require quite a bit of knowledge about Linux systems before it's wise to start using them.  I'd stick with one of the more user-friendly distros like Ubuntu or Mint, and you can jump ship to something more involved (a lot of people seem to jump to Debian, which isn't as involved as Arch/Gentoo, but is a bit moreso than Ubuntu/Mint) after you get familiar with Linux as a platform.

My advise is to just install a simple distro first like ubuntu or mint (maybe dualboot) then watch some youtube videos on basic tasks, but there is no better learning then by experience so my advise is just use it a lot and if you dont know something search on the web or ask on fora

I agree with Azgoth 2 his explanation is very good, I might have one usefull addition for arch (which is my daily driver) there are a few forks that run just as well but offer much easier installation, namely: antergos (recommended) and manjaro (not so recommended) for a desktop environment I always use xfce since it is lightweight and very customizable after a lot of theming I was able to get it look like this (had to make my own gtk themes and xfwm theme and modify dockbarx themes)