A bajillion things. I’m not sure how to even think of this as a category, or imagine someone who doesn’t use techniques they learned as children (when we learn most of the things we know about daily life), or what you mean by a trick versus a technique, or whatever. And, when you think childhood ends.
Brainstorming:
alphabet song like you
how I tie my shoes
how not to wet the bed, by checking whether I’m dreaming or not before I pee
how to roll and cross my eyes
how to whistle
how to raise eyebrows independently
ways to not wet or poop myself, and/or hold it when needed
how to get mosquito bites to not itch, using fingernails
how to go to sleep by imagining and immersing in stories and scenes and so on
how to run faster than most people
how to shoot rubber bands very accurately
how to build a fire
how to invent interesting games
how to program a computer
Ok, it’s endless . . .