Wash out the rice with water until the starch is mostly removed and the water runs clear. This can be done in a colander or directly in the container where you plan to cook your rice, by stirring and continuously emptying out and adding more water until the water stays clear.
Once the rice is washed, add in the measured amount of water.
If making on a stovetop, use a medium saucepan & bring to boil. Once at a boil, lower the heat setting to low, cover, & cook for 20 minutes. The water should have all absorbed and the rice should be cooked. Set aside to cool a bit so that it can be handled, but keep it covered.
If using an Instantpot : Add rice and water and use the rice setting. Once cook time is complete, let the pressure release by itself, which will take about 10 minutes.
Heat the rest of the ingredients (salt, rice vinegar, white sugar, oil) in a small saucepan on medium heat until the sugar is dissolved and then let remove from the heat and set aside to cool. Pour this into the cooked rice & stir. It will look wet, but keep stirring. The rice will absorb this mixture & become drier and sticky.