Many origami models begin with creating a square base. Examples of such designs are cranes, flowers, frogs, etc. Almost every other base is created from a basic square fold, which is also known as a preliminary fold. It is a fundamental origami base that every origami enthusiast must familiarize with.
In this below link you will learn how to create a preliminary base through tea bag folding, which is nothing but a basic square fold. Learn the base thoroughly and try to inculcate in your origami models.
https://www.origami-resource-center.com/preliminary.html
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