What kind of bookmarks do we need?

The application of bookmarks can place several times the amount of content without bookmarks in the same area, thus greatly saving the length of the webpage. It also more clearly indicates the peer relationship of the content. Therefore, in the past year, various websites have gradually started to use bookmarks. The popularity on major portal sites can be traced back to last year's YAHOO redesign... New Internet applications are undoubtedly good, but many things are overdone. So, what kind of bookmarks do we really need?