How to create your favorite song video list or lists? I would like to create favorite lists based on languages or categories. If that is not possible, is there a way to add songs to a favorite list? Maybe I am blind, can someone guide to it.

Thank you.

When you play a video in kmplayer, you can press the flower button. For audio only, you have to use the 'Copy' option from the menu and then select a position in the 'Favorites' list and then choose 'Paste' or 'Paste in new Group' from the menu.
Note that 'Copy' works for every list and 'Cut'/'Paste' only for the 'Favorites' list.

You can also list the links in a text file. each link on a new line, save it as .m3u and open in kmplayer.

Oh forgot to mention that if your media links are files on the device, you can also choose 'Generate playlist' from the menu and choose 'Directory Media Scanner', select the folder that has the files.
KMPlayer will then start playing on the first item. Either copy one by one or select the top item 'Directory media Scanner' and then 'Playlist Options' from the menu, followed by 'Export as m3u'. After that, open this m3u file and copy the top link to favorites.