Grammarbook.com gave the following rules that will help us learn how to use “different from” and “different than” 

(a) Different from is a separating phrase followed by a noun or pronoun.

– Alone, the adjective different is not comparative; it differentiates one thing (noun or pronoun) from another.

Example:
My guitar is different from your ukulele.

(b) Different than is a comparative phrase usually followed by a clause.

– The logic here is than typically follows a comparative adjective such as stronger, shorter, or simpler or a comparative phrase such as more colorful or more legible.

Example:
John is stronger than Thomas.

Source: Grammar Book

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