If you're an origami enthusiast, you might agree that sink folds are the most important and fun folds to work on. Many basic structures are created by these folds. There are various types of sinks folds and you can further add your innovations to it. Mainly there are two forms of this fold; open sink and double sink folds which are created by opening the paper and making a crease to generate a cavity inside the paper.
Click on the below link and learn more about how to make a perfectly open and double sink fold that could help you in creating appropriate origami bases and structures.