Shopify Liquid Syntax - What is the difference between {%- assign [some_var] = [some_val] -%} and {% assign [some_var] = [some_val] %}

When yo use {% assign variable = value %} you keep any white space if there is any.

But if you use {%- assign variable = value -%} the white space is stripped.

That's the main difference.

PS: This is true for any liquid operation{%- if -%}, {%- capture -%} etc.. even if you like to output something like so {{- -}}.