A non-linear editing system (NLE) is a video editing (NLVE) or audio editing (NLAE) system which can provide editing method for video clips or frams. You will be able to access any frame in a video clip. Non-linear editing is done for film and television post-production. However, the cost of editing system gone down and non-linear editing tools (including software) are now within the reach of most home users.
That said, I am also long time ‘nix user (from before we had the GUI) and other OS. Linux has its place but fast video editing isn’t one of them. My office needs to edit about 3 hours of video every day, splicing together the scenes from two fixed cameras. There is some Linux software that might do it, but it is just too slow, awkward and buggy to use. We use Womble’s DVD Wizard software on Windows on that. It’s not expensive, good support and very fast to use even on lower spec hardware.
Pitivi has been around for a few years too. This video editor for Linux is a GNOME application and is designed to fit into the GNOME desktop. (I assume it will work just fine in KDE or XFCE too.) Installing it requires the use of Flatpak, but they give rather easy-to-use instructions on the Pitivi website, and I had no problems at all. Drag-and-drop seems to be well supported, and it first transcodes videos before they can be used, which takes a few minutes or seconds, depending on the size of each. But it appears the videos can still be used during this process.
Right now there is one really serious competitor coming out with it’s brand new open source non linear video editing product. I am talking about Lightworks` Oscar winnig Editshare which has been released open source last year. Feel free to discover their website http://www.lightworksbeta.com/ and tons of professional features it has. Yes this is not intended for video editing noobies but this is going to become a really brilliant piece of software for Lin/Mac/Win. Right now only Win version is accessible but:

What’s great about most Linux video editing software applications is that they tend to be free and open source, which means that anyone can peek under the hood and implement new features or fix bugs. The video editors featured in this article are loosely arranged according to their popularity, but we recommend you go through the entire list because even less popular video editors have a lot to offer.
Also, one of the thing I love from Linux is the variety in the distros. What’s the problem with that? Canonical is doing a great effort to come to home users, more than RedHat or Novell… use then a Debian-based distro like ubuntu, but let us the rest of the people with our distros, with our beloved desktop or window manager… anyway, it doesn’t affect to aplications since we all can compile from source (at least in my case, because I use gentoo and I must always compile from sources), and you can find binaries for debian-based or rpm-based distros.

This video editor has the ability to move things in the visual space straight in the viewer panel compared to the others where you need to change some value of x or y to scale or move things in your composition. This might not matter much in many cases but if you have a lot of elements moving or scaling throughout your scene, this is the fastest and a much more intuitive method than having to adjust the scale/position values of individual axes separately. This again is a big reason why I prefer an alpha (a damn good alpha) version of this software than a stable release of Kdenlive. See More
Preview very slow (need to create a proxy 25% the scale and also resize the render output and even then it's often still slow) Doing a zoom (pan/scan) requires hacks https://blender.stackexchange.com/questions/42094 Transitions are fully manual Playback speed adjustments are very manual especially if you want to keep them in sync with the audio. .... See More
Whether you’re a professional video editor looking to get some serious work done, or a regular person looking to make a quick slide show, we’ll help you find the best tool for the job. All of the video editors we cover in this list can be found in most Linux distribution’s software repositories. To install any of them, just open your package manager, search and install. Alternatively, visit the websites linked to install them.
Regardless of whether you’re looking for a simple video editor to help you edit footage recorded on your last vacation or a professional solution fit for an aspiring filmmaker, there’s no reason to switch to a different operating system because the number of fantastic Linux video editors has never been greater. Best of all, most Linux video editors are available for free, so you can realize all your video-editing aspirations even if you’re on a tight budget.
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