What does Canon 60D kit mean (18-200mm yes)?

Simply understood in the vernacular, 18mm-200mm is the size of the subject near and far when the lens takes a picture. Setting it to 18 is like looking at distant objects with naked eyes, and setting it to 200 is like looking at distant objects with a telescope in the distance. If you don't understand, you can go to some local outdoor activities if you buy a machine. There will be many teachers in the photography group to teach you for free. Self-study is faster than you, play and learn, and make friends.