Useful cases
Pass a field to a page:
{Name (First):6.3}
Pass a field from many forms to one page:
If you have 2-3 Gravity Forms and you want to merge the content of a tag to a Page (i.e. Thank you page), then you can you the global merge tag that is (Just be sure that you have the same name on all forms.):
{Name (First)}
Pass the value of a field in a page:
If you want to see the value of a field from a radio button, drop-down list e.t.c., use this:
{Radio Buttons:35:value}
More details here: https://gravitywiz.com/documentation/gravity-forms-post-content-merge-tags/