Use a Token in Minimum Field I am new to rather new to Drupal (coming from Django/Python), and was wondering if there was anyway I could use a token in the minimum field of my registration. 

What I basically have is a registration from, which is then a field in one of my content types. In this content type I also have a field called minimum deposit. So I wondering if I could somehow link the value in the minimum deposit field to the minimum in my registration? Like for the minimum value have: [node:minimum_deposit].
In a nutshell, there is no way that I know to do this with a token. You need to create a custom module that implements hook_form_alter() to set the default value of your minimum deposit field before the form is rendered. You'll set this default value using the value of the field in the pre-existing node (you'll need to load the node programmatically within the hook function and get the value of the field).

I could give you more details if you let me know what type of form you are using: are you creating a form programmatically with Form API? Using Entityform module to create the form? Using Webform module? Using the "Add to Cart" form provided by the module Drupal Commerce? Post a comment below and I'll edit this answer.