All videos you liked will be shown on the "Favorite/Like" page on your account dashboard.
To "Like" a video, you can visit any video and click on the thumbs up icon at the bottom of the video page.
To Bookmark a video, simply click on the watch icon at the bottom of the video page and a pop-up option will be shown. The pop-up window will allow you to put the video on your "watch later" list or add the video on an existing playlist or add new playlist. if you select, "Watch Later" then the video will be saved under the "Bookmarks" page on your account dashboard.
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