Here's how to use it:
* "Bem-vindo" for a male guest
* "Bem-vinda" for a female guest
* "Bem-vindos" for a group of guests (plural, both genders)
You can also use "Seja bem-vindo" (masculine) or "Seja bem-vinda" (feminine), which is more formal.
Let me know if you have any other questions! 😊