I have to code an app where I have drop downs and when someone changes the option in a drop down, it sorts all the different names by who falls into that topic. Like if someone chooses birth month as the category and then chooses December in the drop-down, it sorts all the names who have December birthdays and place all those names into a text box

I tried creating a function but it’s not working. I just don’t really know how I’m supposed to code this. I’ve tried some different things and I have the data sets. I just don’t know how many lists to make and what variables to make and then how to apply them