Does anyone know where to find worksheets on Linear Algebra and Matrices?

(projection theory, vector spaces, kernel, inner product, cauchy-schwarz, gram-schmidt, fourier and haar bases for linear algebra. Hadamard matrices, real and imaginary matrices, adjoints, unitary matrices etc for matrices)

I have a feeling that these sections are the hardest of all in all of the maths that I've learnt this semester (I learnt about vectors, partial derivatives, multiple integrals, vector calculus and this section) because it is so abstract, and worse, I don't have any references to them! That's why I'm looking for resources for me to practise these problems if anyone knows any.