(=également) also, too
J'aimerais aussi que tu achètes le journal. I'd also like you to get the paper., I'd like you to get the paper too.
Je parle anglais et aussi allemand. I speak English and also German., I speak English and German too.
lui aussi (sujet)
Lui aussi parle espagnol. He speaks Spanish too., He too speaks Spanish.
Je l'ai vu lui aussi. I saw him too., I also saw him.
"Dors bien." -- "Toi aussi." "Sleep well." -- "You too."