Learn English – Is the ‘w’ in sword silent

The "c" is silent when preceded by an "s" followed by an 'e' or an 'i' at the beginning of a word.
Found this on a site which had rules on silent letters. Authenticity is not known, but it sounds correct.

Yeah, it's probably meant to make sure people don't say something like "duh-jango". Many English speakers don't know that much about phonetics and aren't consciously aware that the "j" sound is an affricate that starts out the same way as the "d" sound.

Even if they are aware, some might mistakenly think "dj" was supposed to represent a lengthened version of this sound, i.e. /dd͡ʒ/ realized as something like [dː͡ʒ]. See the answers and comments to this ELU question ("In the word “Scent”, is the S or the C silent?") that assert that "scent" is pronounced with a longer initial consonant than "sent" or "cent". I think these comments are wrong, but it shows how someone might think this kind of thing based on the spelling.