This is a very big topic. When people talk about meditation, usually they don’t understand what the word means. Television, marketers, have changed the meaning of the word. They say meditation - it’s a practice to maintain a good mood. But they are very mistaken. When we talk about meditation, the best way to find out about this is to refer to source sources, such as canonical texts ( "Ānāpānasati Sutta" , "Abhidharma" ). The best practice of meditation, is the practice of " śamatha ", this is the most simple and understandable method of achieving calm.
Beginners should practice for 10 minutes every day, in the future, meditation should last about 1 hour. This is a very wonderful feeling, which is a good tool to achieve peace of mind.