THE WATER TEMPERATURE

The golden rule about water temperature is never use boiling water on the tea, whatever kind of tea you are making.
Green Teas require water at 70°C and black teas require water at 85-90°C.
These days you can get kettles which enable you to choose your water temperature.

THE AMOUNT OF TEA

Custom dictates that 4 grams are sufficient for one cup. But the amount is partly a matter of preference.
In the case of Assam tea, which is naturally very robust, you might want to reduce the strength and brew 3 grams instead of 4.

THE BREWING TIME

This is a very important step in the art of tea-making. In fact, the brewing time varies depending on the type of tea. An over-brewed black tea will develop a bitter taste whilst an under-brewed white tea will be flat and insipid.
Black teas are normally brewed for 2-3 minutes, green teas for 3 – 4 minutes. It is a good idea to check the brewing time before making the tea, because some teas need to be infused for very specific times: for example, Jade Pearl is left to infuse for 7 – 20 minutes, whilst Oolong tea will need 5 – 7 minutes for its bouquet to develop fully.
Brewing is normally done with a lid on, so that the tea retains all its aromas.