I think the classic book from Dr LaBerge [0] is quite good (although dated).
Lucid dreaming itself is a researched subject and there are a lot of material on that but the simplest techniques as keeping a dream journal (writing what you dreamt about each morning) so the mind recognizes that it's important to be aware of dreams and testing if you are dreaming. When you are reading this comment do you think you are dreaming? How do you know? Contrary to usual thinking dream world is quite different from "normal" world. For example you can block you nose and mount in a dream and not suffocate. Or turn on a light, in a dream it won't be as fast as in real world.
Usually sleeping during the day also triggers lucid dreams. One way or another it's a skill one can learn given some time and practice.
Lucid dreaming itself is a researched subject and there are a lot of material on that but the simplest techniques as keeping a dream journal (writing what you dreamt about each morning) so the mind recognizes that it's important to be aware of dreams and testing if you are dreaming. When you are reading this comment do you think you are dreaming? How do you know? Contrary to usual thinking dream world is quite different from "normal" world. For example you can block you nose and mount in a dream and not suffocate. Or turn on a light, in a dream it won't be as fast as in real world.
Usually sleeping during the day also triggers lucid dreams. One way or another it's a skill one can learn given some time and practice.
[0]: https://www.amazon.com/Exploring-World-Dreaming-Stephen-LaBe...