I have been using (Corel) Pinnacle software since around 2000.
Today I use Pinnacle studio 17 ultimate
Everything is drag and drop and the ability to convert just about any type of video file to another video file regardless of extension or size. Even can strip the video track off and just make an audio.
Latest Pinnacle Studio 19 Ultimate
http://www.pinnaclesys.com/publicsite/us/products/studio/ultimate/
they also give you opportunity to upgrade to new packages with existing software for around $40 bones.
Software comes with video tutorials that load into your pc when you install and there are some most excellent video tutorials on youtube.
this one here... has 4 different video tracks going so you can drag and drop to your video creation pane and grab scenes from any of the 4 cameras in use.
Super easy to use, just like any software, takes a little time/effort to actually sit down and use the dang thing. If you go away from it for a long time and start to use it again - it will all come back to you quickly.