Such as:
To give examples: "She doesn't like small animals, such as cats and dogs".
Such a/an:
To strengthen opinions: "He is such a nice person". "Today is such an amazing day". "My Ferrari is such a red car".
(such + a(an)+ adjective + noun)
Such:
To refer to someone or something already mentioned: "Some children are too excited in class. I don't know how to teach them in such situations".