The difference between tú and tu!
Tú (a personal pronoun) basically means you (informal) and tu (possessive adjective) basically means your (informal).
Tú eres alto. = You are tall. Tú y yo = You and I
Es tu gato. = It's your cat. ¿Dónde está tu libro? = Where is your book?
Exacto, en Español un acento hace la diferencia entre una palabra y otra, inclusive puede cambiar el sentido de la palabra en algunos casos.
You're welcome! if do you want to practice your Spanish? Here you have a partner Best regards!
Regarding placing accents above the letters, I found it helpful to add a Spanish keyboard to my iPhone. It's invaluable for speaking rather than typing.
Yes. I knew this. It is very difficult for me, though, especially because I can't make that little accent above the "you" version. I can only make two dots above the U.