* You Need to Know Your Plants and Its Environmental Needs
Virtually any type of trees can be made into bonsai plants. The specific species of your bonsai plants will determine the way they need to be grown and cared for. If your bonsai is made from a tropical tree and you happen to live in a cold area, you really need to give very special care to that plant.
If you want an easier life, you may just choose trees that will go well with the conditions in your area. Despite their size, bonsai trees also need to adapt to any changes in environment. In case your bonsai originates from a special species, you should make sure you understand its specific caring requirements before you pick it up.

* Properly Water Your Bonsai
Dependent on its species, the soil type and the season, bonsai plants may have different watering needs. You will need to develop a watering plan just for your bonsai.
Having discussed bonsai's watering needs, you should be aware that neither over-watering nor under-watering will do any good to your plants. A simple way to determine the level of watering required is to feel the soil with your fingers and nails. Moist soil is a good sign, whilst dry soil usually means that you need to start watering right away.
Most bonsai owners water their plance every day in summer but only do so every other day in winter. This does not apply to all bonsai plants. If your bonsai is made from a very special species or if the soil condition in your area is a bit unusal, you must have a different watering plan for your plant.

* Grow Outside for Sunlight
As a general rule, bonsai plants need sunlight and should be grown outside. They are not indoor ornamental fixtures, although they appear more like an art than a plant. Without sufficient sunlight, bonsai plants will get sick or may even die. The only exception is probably where you have a tropical bonsai but happen to live in a cold area. In this case, you will have to develop some sort of indoor protection for your plant. Usually, bonsai plants that are native to its place can always do well outside even in winter days. However, protection is needed in extremely harsh weather.

The above are just some bonsai caring tips for beginners. If you are enthusiastic about growing bonsai plants, you may feel the need for more in-depth knowledge, such as pruning, wiring, re-potting, etc.