Yes when hand creating any links, you must know the true path to the file that is the link starting point and the true path to the destination file (the link's ending point).
So either mousing over both to see their path or turning on full paths in Sigil Preferences will do that for you.
But why not let Sigil handle all of that by using the Add Cover, Insert Image, Insert Link, Insert Style tools to automate that process for you.
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