I live cooking,cookery is the art, technology, science and craft of preparing food for consumption
Cooking is part of the human soul.  It is part of how we attained mastery over our environment and how we separate ourselves from other animals.
Yeah ,techniques and ingredients vary widely across the world, from grilling food over an open fire to using electric stoves, to baking in various types
That's right!  The various techniques are linked to a people and a culture's history, which is why food and cuisine are considered important cultural indicators.
skill and type of training an individual cook has determines the type of cooking
That's true, this is why chefs attain such seemingly outsized cultural importance despite the fact that 90% of humanity can cook decently.
I particularly use the Pressure cooking method which is  the process of cooking food, using water or other cooking liquid.
Pressure cooking is a great way to save time.  The added pressure increases the temperature and cooks food much faster.
When I cook rice is use the rice cooker or rice steamer is an automated kitchen appliance 
That's definitely convenient!  As long as rice is a staple of your diet, as in eaten almost every day.  Otherwise it's another kitchen gadget to collect dust.