If you have long nails, always use gloves while doing household work. Do the same if your job involves chemical work.
Be careful that you do not use your nails to open bottles or to remove staples as it can easily damage your long nails.
If you find that gloves cannot be use in a particular task, then make sure you have used a nail hardener which will help you in protecting your nails.
Another important thing you need to do for protecting your nails from splitting is that you do not cut them into corners. Cut them straight across as it will give them a good shape and will save them from damaging.
You should not use metal nail file if you have an emery board. A metal file can also cause your nail to split as it is not smoother for nail filing.
Make sure that your nail remover is free from the harmful chemical called acetone, which makes the nails weak.