Im pretty set in my ways with Sony Vegas.
its not nearly as expensive as some other products while offering the majority of the same ability. It has a few short comings but they are very few IMO. If you get the right version or the right discount its fairly priced.
If you are just experimenting though or have basic products I would just try the free windows movie maker editors.
No matter what you choose to go with it would be wise to perhaps google and youtube for some tutorials to get started as there are sometimes some very simple basics that are easy to over look that make a huge difference in your ability to properly and efficiently use the program.
Once you have those basics down, then you can start to really self learn just by using the program and messing around with it some.