Different materials need different approaches to washing, drying and getting rid of creases. Wool, for instance, should only be washed when really needed, and delicate fabrics such as cashmere and silk, are particularly vulnerable to damage by harsh chemicals and heat so will need to be washed on a gentle cycle at low temperatures.
Pay careful attention to the instructions on the label on the inside of your garment as they will tell you the maximum temperature it should be washed at, whether it can be ironed etc. Not sure what those symbols mean? Have a look at this handy web page guide.
It’s the sad truth that all wool clothing and many other materials will start to pill eventually, no matter their quality. Bobbles and pills on clothes immediately make them look dull and worn meaning they are more likely to not be worn.