I am super new to anything coding and google sheets. All of what I've done was was trying to follow the directions of another question I saw on this site. However, as expected, nothing is working!
Here's the deal, I want to assign values to certain drop down items, then,the value of the drop down, along with other drop downs, would be added to a separate cell.. However whenever I try to assign values items in a drop down, I keep getting errors. Below is an attachment of what happens.

So to start off, I have the list. I input the formula as I saw it on another thread. IF(cell="item",value,0). Whether I list one item in the formula, or all, I keep getting the error of "Invalid, Input must be an item on specified list." The Cell automatically turns to a 0 after I input what I believe to be the write formula/function for this to work.
So I come here to ask anyone, to help me figure out what I am doing wrong.