(These will be a basic sentence for each so that you can understand how you should use them and can try your own) :)
Ce = J’adore ce nouveau sweat parce-que je pense que c’est très confortable.
Ce Translation = I love this new jumper because I find it very comfortable.
Cet = Cet écolier étudie à cet université.
Cet translation = This student studies at this university.
Cette = Elle n’aime pas cette robe car elle n’ai pas les chaussures assorties.
Cette translation = She doesn’t like this dress because it doesn’t match her shoes.
Ces = J’ai ces lunettes depuis des années.
Ces translation = I’ve had these glasses for years.
The ending of Ce depends on the context. For example, Ce means this but you cannot pair Ce with a word beginning with a vowel so you add an t to make cet. However, if the word is feminine you add te as well.
Masculine word after this = cet
Feminime word after this = cette
The same rule applies when the word after this is plural but you don’t need to worry about masculine or feminime as you just use ces.
For example, ces lunettes = these glasses (plural)
Hope this helps and apologies for the basic response but you can develop your own answers using these as a guide hopefully ! :)