Besides simply searching on google for how to lucid dream, do you have any specifics on the various methods and/or any tips on how to get started?
As a quick start however:
1. Keep a dream journal and write down dreams as soon as you wake up, as much as you remember. You will get better at this over time.
2. Perform reality checks. Count your fingers or blow air out your nose periodically.
However, there is a much more powerful concept called All Day Awareness. It is the notion that reality has a surprising amount of detail but we are just not aware of it during the day to day. So, just stay where you are and observe the environment. Look at things, hold them up close to your eyes. For example, take a leaf or piece of paper or your hand and see all the individual details. Fully be aware. This helps you understand when you're in a dream and so you'll be lucid.
3. Each night, say you'll lucid dream. It will work with enough practice such that you do lucid dream. It's not guaranteed however. This technique is called MILD, or mnemonic induced lucid dream. There are others.
Note: using substances like alcohol and marijuana especially will kill your lucid dreaming attempts as they inhibit REM sleep, especially weed.
[0] www.reddit.com/r/LucidDreaming/wiki/index
Once you're in the habit of doing that, you'll start doing it in dreams, too. And in dreams, you're very likely to realize things aren't real, and that you are, indeed, dreaming.
That's the technique that works best for me.