'glance' and 'glimspe' mean the same thing: to take a quick look.
However, 'glance' is a verb therefore you use it like: I glance at the newspaper each morning. I glanced over it but didn't take much notice of what it was saying.
'glimpse' is a noun so it is used in cases like: I took a glimpse of the newspaper this morning. I had a quick glimpse at the book.
(to take a glimpse = to glance) (to catch a glimpse = to see momentarily and unintentionally)*
*These are compund verbs where you have to use the entire phrase for it to make sense. English is a big fan of them!