If you slightly burn rice on the bottom of your pot, you can remove the burnt taste from the unburnt rice by placing a slice of fresh white bread on the top and then covering the pot. After 5 minutes the burnt taste should disappear.
Wait to add salt to the rice until after it is fully cooked, as it may cause it to toughen.
To keep rice white while cooking, add a few drops of lemon juice to the water.
A few minutes before your rice is done, place 2 layers of paper towel under the lid and let it finish cooking. The rice will be dryer and fluffier.
To prevent rice from getting mushy, during the final stages of cooking place a kitchen paper towel underneath the lid to absorb any condensation
Don't ever be afraid to taste test your rice for doneness.
Perfection in anything requires some trial and error - you need to find what works with you in your kitchen.