How to know what exercises should i do on an ankle sprain?

ROM: Once the pain has resolved it is helpful to perform range of motion. To do this, sit on high chair or edge of bed so that your foot doesn't touch the ground. Then using you big toe like the tip of a pen draw out the alphabet in large capital letters using the muscle of your ankle. 20 minutes 2x/day helps strengthen the muscles.

Some suggestions: Using a resistance band around your forefoot, hold the ends of the band with your hand and gently push your ankle down as far as you can and then back to the starting position. Repeat 10 times. Tie the resistance bands around a fixed object and wrap the ends around your forefoot. Start with your foot pointing down and pull your ankle up as far as you can.