Wash potatoes and dice them small. Add the coconut oil (or other fat) to your skillet and turn the heat between medium and medium-high. You want a thick layer of oil coating the bottom of your skillet. Don't skimp out or else your potatoes won't brown or crisp properly.
Add the diced potatoes to the skillet and stir them to get them coated well. Then let the potatoes sit for roughly 5 minutes so they can get golden brown and crispy on the bottom. Adjust the heat, as necessary.
Add in 3 cloves of pressed garlic or minced garlic, Montreal seasoning, salt, and pepper. Stir well and let the potatoes sit again for between 4 to 5 minutes to get golden brown and crispy. (You can add more coconut oil now if there's not a good layer of fat on the bottom of your skillet to brown the potatoes.)
Once most of the potatoes are golden brown and crispy, take the skillet off the heat. Taste the potatoes and adjust the seasonings, as necessary.