Tips for how to cook crispy Hash Browns 

1. Squeeze the moisture out: You can use a tea towel, an orange press, potato ricer, or lemon press to squeeze the excess moisture from the shredded raw potato. A salad spinner or a fitted food processor with a shredding attachment can also work well.
2. First, heat the oil in the pan: Make sure you generously coat the pan very well by using enough oil, and before you start adding the potatoes, the oil must start shimmering.
3. The potatoes should be spread in a thin layer: If you want to help the hash browns to be very crispy, make sure you add a thin layer of shredded potatoes in the pan. This will also make sure that they cook more evenly.
4. Before you flip the potatoes, wait until one side of it is brown: Check underneath carefully to see if the potatoes are getting brown well. Flip the potatoes to the other side when you notice that one side is already fried to a golden brown.