Udacity has a couple free linear algebra courses.<p>One here: <a href="https:&#x2F;&#x2F;www.udacity.com&#x2F;course&#x2F;linear-algebra-refresher-course--ud953" rel="nofollow">https:&#x2F;&#x2F;www.udacity.com&#x2F;course&#x2F;linear-algebra-refresher-cour...</a><p>And another here: <a href="https:&#x2F;&#x2F;www.udacity.com&#x2F;course&#x2F;intro-algebra-review--ma004" rel="nofollow">https:&#x2F;&#x2F;www.udacity.com&#x2F;course&#x2F;intro-algebra-review--ma004</a>