How to hide a field based on selections made in another field: dropdown/radio/checkboxes?

You can use the Show and Hide Field condition in order to achieve that. Please check this demo form: https://form.jotformpro.com/72597186947981. Here's a guide on how I created that demo form:

1. I inserted a Single Choice field and 3 Short Text Entry fields.

2. After that, I created a condition wherein a specific field will appear depending on the option selected in the Single Choice field. Here's an example:

If the Single Choice field is equal to "Red" then the "Why Red?" textbox will appear.

3. You also need to apply a condition for each option in the Single Choice field.

Here's the result:

Related guide: 
How-to-Show-or-Hide-Fields-Base-on-User-s-Answer
Hide-or-Show-Multiple-Fields-at-Once

Hope that helps. Let us know if you need further assistance. Thank you.