As a verb:
* I bookmarked the article so I could read it later.
* She bookmarked all her favorite recipes on the website.
* I bookmarked this website because I found it very helpful.
As a noun:
* I added a bookmark to my browser so I could easily find the website again.
* He found a bookmark in the book, with a handwritten note from his grandmother.
* I use bookmarks to keep track of my favorite online articles.
In a figurative sense:
* This event was a bookmark in my memory - I'll never forget it.
* This movie was a bookmark in film history - it changed everything.
The context will determine which meaning of "bookmark" is most appropriate.