In Spanish, they have accents (´) as in (á, é, í, ó, ú) over their vowels and one of their letters has a tilde (˜) as in (ñ) Also, there are the following symbols: ¡ and the ¿
Using the accents and the symbols can look as follows: ¡Hola! ¿Cómo estás?
The following link are the codes (alt codes) to make them on your computer. On this website, there are codes for those that use a Windows computer and another set of codes for Macintosh computers and are organized for each system