Everything in existence — be it biology, computers, science, art — builds upon foundations from the past. Singular blocks are combined to create a new structure, which are combined to create something new, which are then combined with something else to create something new.
Always create, and keep everything you make. Finished products come from a collection of small finished products, and everything you make can become a building block for something larger. It doesn’t matter what you do, this method of creation and collection can be applied to everything.