"Too" usually indicates degree. example: I burned my mouth because the coffee was too hot. The word in Spanish would be "demasiado" "Also" usually indicates similarity example: I am also learning a new language. The word in Spanish would be "tambien"

Generally, "also" should be used before the verb and "too" should be used at the end of a sentence.

i also have some boyfriends~ i have some boyfriends too. That's the difference.