If you mean in Safari, tap the bookmarks icon - the open book icon in the upper left part of the toolbar - and when it opens, tap on the Open Book icon at the bottom of the window to get to your bookmarks. At the top - tap on bookmarks bar to get to those bookmarks. In the next window, swipe across the bookmarks that you want to delete.
You can do the same thing in the reading list if you want to remove items from there.
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