Cinelerra *had* the most promise and it’s probably good if you want to run a TV station. However, it’s not creative at all. Simple edits are easy. However, anything else can become a stunt. IMO, Kdenlive has seen the quickest growth. Lives is also doing well. In the next few years we may see those apps grow into the free alternative of Finalcut – but not Cinelerra. It does what it does, and there is no need to change.
The point is, I make some of my income from editing video files. They are an important part of our business’s value adding strategies. So I don’t have time to experiment. I need something that works and is easy for our staff to master. Windows and Mac software does and, like most businesses, we’re happy to pay the price so that we can get on with the job. BTW, the package we’re using costs less than $100.00 per seat, has easy to understand configuration and user settings, is easy to master, makes editing, cutting, dubbing a doddle. It also batches files for rendering (from the GUI). it is reliable and robust, comes with excellent support and the authors have been quick to respond to requests for new features. It is also written to actually run in a multitasking environment so we can do other things when video files are being rendered. Linux authors, take note.
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Pitivi could be described as the Linux alternative to Windows Movie Maker. Both video editors have a clear user interface that doesn’t present its users with a steep learning curve, and both are intended to help regular people express themselves through videomaking. Of course, Windows Movie Maker is no longer in development, whereas Pitivi is developed by a fantastic community of people who believe in open source software.
By far, this is the most professional video editor for Linux available in the market. DaVinci Resolve is a powerful video editor and is commonly used by cinema production houses all over Hollywood. It comes with amazing features such as editing, professional audio post-production, and color correction, enabling professionals to create TV-shows and even movies.

I’ve twiddled around with a few of the programs mentioned here but they all seem horrifically counter-intuitive. That is to say, I could not figure them out. (and I have the strong motivation of a soccer team clamoring for their annual ‘best of’ movie.) Windows might be f#2%ed, but Apple is downright frightening these days. Free is more and more the only way to go.

I wanted to use a Linux first, open source editor but I rely on stability for work and sadly I couldn't get a workflow that didn't include a significant number of crashes and glitches. DaVinci Resolve on the other hand is absolutely stable, never crashes, never glitches, has excellent tools, a smooth workflow and incredibly fast rendering. IMO better than Premiere. See More

Audio and video clips can be linked together and managed as single clip. Another thing that I personally find useful is that Pitivi can be used in different languages and has a very extended documentation. Learning how to use this software is easy and doesn’t require much time. Once you get used to it, you will be able to edit video and audio files with high precision.
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.

The developers have also added some high-quality video and audio filters and effects aimed at professionals. Unfortunately, this software is not entirely free as it comes in two versions: Lightworks Free and Lightworks Pro. The difference between them is that the latter supports different video formats, while the former does not. Lightworks is available for Windows and Mac OSX as well.
Shotcut is another free, open-source, and cross-platform video editor. Unlike Kdenlive, novice video editors will be able to get a full-fledged experience with Shotcut as it is rather easy to use. It comes with a wide range of features, including native timeline editing, video transitions and filters, and a multitrack timeline. It supports keyframes for filter parameters and 3-point editing. If you quickly need to delete the audio from a video clip, Shotcut gets it done.
Look at the screenshot I attached above. I want you to look at the left sidebar. The #01 “Getting Started” video is what I just walked you through. You can see there are more video instructions. The videos are between 2 and 5 minutes long each, so it doesn’t take long at all to become acquainted with the software. The 5 additional training videos include the following topics.