The essential thing is to train these fundamentals:

1.Self-awareness: SA is the most effective tool for both WILD and DILD. It is the key for WILD, and as for DILD, all pros use it and get that:"I just knew I was dreaming". SA is also the key for dream control. It is the most important aspect of self-awareness.

2. Memory: when you see something weird in a dream, you don't see it as weird not because you have low awareness(normal awareness, not self-awareness), but because your memory is impaired. So, self-awareness is a great way to activate the memory.
Also, prospective memory is important for WILDs and DILDs. You need to remember to stay conscious during WILD, and need it(prospective memory) to remember the intention you placed(MILD).

3.expectation/intention: Dreams are partially formed of our daily experiences, so you need to do things during the day hoping they would be part of the dream. That is called expectation. RC works, but I also do RRC. It is great for improving self-awareness. Intention is when you say you want to, for example,RC when you see a dreamsign that appears a lot in your dreams. Again prospective memory aids that, it is that.

See how they are connected with each other and form a strong unit that supports the whole LDing!? So, I personally do RRC, DJ, WBTB, MILD, WILD/DEILD. I hate other techs because they are only other forms of the same thing, and may get you lost and even hinder your progress. Plus, doing these is building your whole LDing future, since these are the essence of inducing lucidity and dream control. Plus, these are direct, accurate and work for all.

You might wonder why isn't everyone using these? Most do, but add other techs that promise fast LDs, but no real benefit for the fundamentals, plus they can hinder the fundamentals. The rest just feel lazy doing all of these or just started the first tech they heard of.