is like when you say: It´s a pleasure and: you´re welcome.

Con gusto = My pleasure. De nada = You're welcome

You're welcome - we'll finish it with a third-person thanks With pleasure - we occupy it when they ask us for a favor or take some action Examples: - Thanks for serving me water. - You're welcome -Would you take me to school? - I'll gladly take you

"con gusto" the activity had not finished yet, "de nada" the activity is already finished, it has the same meaning that "you're wellcome"