Being "meticulous" means being very careful to do things the right way. It means paying attention to details. For example, a meticulous student might take lots of notes in class and then organize them at home.
People are "meticulous" about things like:
- their work
- the cleanliness of their home
- their homework
- preparing for things
"Meticulous" is a positive word. A negative word to describe someone who pays attention to details is "fussy":
She can be rather fussy about money.