When houseplants get brown tips on their leaves, it's generally an indication of poor watering habits. The best way to water a houseplant is to thoroughly flush it until water runs freely out the drainage holes. Shallow watering can cause brown tips on the leaves. But, brown tips are also an indication of lack of humidity.
Many common houseplants are native to jungle conditions so if your home is very dry, you'll need to mist your plants and give them a shower every few days. Brown leaf tips can also indicate a buildup of salts from too much fertilizer or from softened water. Don't overfertilize your houseplants and, if you use softened water, buy distilled water to keep your plants happy.