tutorials sectionFirstly hi and welcome to the forum

Reality Checks are basically when you question if you are dreaming. You do this a few times a day so that when you are in a dream, your dream self will go "Am I dreaming?" then perform a reality check and hopefully you will then go lucid.

There are many ways to do reality checks, from just asking your self if you are dreaming or turning a light on/off to see if it works properly.
Theres a section on reality checks in the tutorials section.

I prefer 11. The Breathing Test because if usually always works in a dream.

Hope this helps