Here is an article about main techniques. Every other technique is a variation of two main techniques - DILD and WILD.

The best technique is the one, that will get YOU lucid and that suites YOUR lifestyle. There is no such thing as the easiest or most reliable one, because it works differently for everybody.

That said, if you just starting out with lucid dreaming, DILD is the technique that's recommended the most. Just because for WILD to be successfull, there is a lot of components that have to go exactly right.

So I would suggest to read up on all the techniques and methods and see, which one will match your lifestyle the best and try it out. Give one method sufficient time to see if it works, but that doesn't mean, you can't try more of them at the same time. Check out the DV Wiki for tutorials. Happy dreams