If you're referring to bookmarks in your browser, I'm sure that depends on the browser.
On my Samsung Galaxy Note 10.1 (2014), when you open Chrome you can then tap the 3-dot menu to the right of the address bar. Tap Bookmarks, this opens a tab listing all your bookmarks. In the list of bookmarks, tap the 3-dot menu next to the one you want to delete and select delete from the menu.