I understand the basic concept of why this message occurs.
Even so in my effort to understand Gumloop better by building templates for personal use cases, I keep running into it.
It would be useful to me to get a visual indicator of the possible alternative connections I can use. Otherwise, I tend to start guessing. Whilst that works for experimentation, I want to get familiar with which connections lead to errors.
The link below is useful but limited in the potential mismatch error examples.
Adding in a comment seconding this request for more education on the mismatch errors. Single value does not equal list is my most frustrating and it tends to confuse Gummie as well. I wind up guessing.