Here are some recommendations I have seen over the past few years. I have not personally taken any of these (I have a math degree already), but have heard these recommended by other people whose opinions I trust:
Here’s a series of YouTube lectures called The Essence of Linear Algebra. Looking at the titles, it goes further than you really need for DL. You can stop before you get to the section on eigenvalues and eigenvectors and you should be fine.
Khan Academy has a Linear Algebra Course.
If you prefer a more college level academic approach, another choice is Prof Gilbert Strang’s MIT OpenCourseware Linear Algebra course. It is the online version of an MIT undergrad math course, so they don’t pull any punches. As with the first link above, you don’t need all the material they cover in order to be successful with the DLS series.
Have a look at those choices and I hope that at least one of them will fit your needs. Please share any feedback you have after taking all or part of any of the above courses.