With 56 free tutorials, the Linear Algebra course is now complete. The course covers Vectors Basics, Systems of Linear Equations, Vector Combinations & Span, Matrices, Eigenvalues & Eigenvectors, and Complex Numbers! There are tons of detailed explanations and worked examples to help you better understand and grasp Linear Algebra and all it's abstractness. 
The Complex Numbers section of the Linear Algebra Course is now complete. There are free tutorials that cover the concept introduction, some operations, and also how to express complex numbers in polar form. 
I created 36 free Differential Equations tutorials that focus on first and second order differential equations. The course covers basic introductions, integrating factors, separable differential equations, Bernoulli differential equations, exact differential equations, nonexact differential equations, Euler's method, characteristic equations, fundamental solution sets, wronskian, reduction of order, undetermined coefficients, and variation of parameters! There are tons of detailed explanations and worked examples to help you better understand and grasp Differential Equations. 
15 new tutorials covering second order differential equations are now up! They cover a few important things about the characteristic equation, as well as reduction of order method, undetermined coefficients methods, and variation of parameters.

Wtf are eigenvalues and eigenvectors? I had that same thought and felt like I wasn't alone, so I went and figured it out and made a bunch of youtube tutorials about them. PS, did you know that "eigen" more or less means "my own" in Dutch? You'll understand the relevance once you go through the videos. Wtf are eigenvalues and eigenvectors Show that x is an eigenvector of A and find the corresponding eigenvalue Show that λ is an eigenvalue of A and find a corresponding eigenvector Find the characteristic polynomial of a matrix Find the eigenvalues and eigenvectors of a 2x2 matrix Find the eigenvalues and eigenvectors of a 3x3 matrix 
9 new tutorials are up on matrix algebra. This is your last chance. After this, there is no turning back. You take the blue pill—the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill—you stay in Wonderland, and I show you how deep the rabbit hole goes. Remember: all I'm offering is the truth. Nothing more.

After a very long hiatus, a new section is up in the linear algebra course covering vector combinations and span. There is about a 5 year gap between the publishing dates of video #25 and #26, whoops. Oh well, I'm back at it again with linear algebra and hope to finish off the set this month. Here are the new videos:
