and difference between "des" and "ces" ?
It is generally like the difference between "some" and "these" in English.
Well, here is a quick explanation:
"Des" is an partitive/indefinite article. It can therefore be translated into "the" or "some". It is derived from the words "de" + "les". If it is used as a partitive article, we place it before nouns to show that their quantity is indefinite and/or imprecise. As an indefinite noun, it simply means "the" (some) before plural nouns.
As for "ces", the word is an adjective which means "these" (or could also mean "those"). It is used before masculine or feminine plural nouns and, in fact, it is a demonstrative adjective.
Here are some examples: "Je mange des fruits". "Pendant le match, il y avait des gens qui parlaient tout le temps". "Ces livres sont trop lourds".
Hope I have helped!
My understanding is that ces goes with ce and cette like this:
ce + singular masculine noun eg. ce livre - this book
cette + singular feminine noun eg. cette pizza - this pizza
Then if the noun is plural you use ces for both m. and f.
ces + plural masculine or feminine noun eg. ces livres - these books; ces pizzas - these pizzas