Looking for online material to revise vectors and dimensions

I'm studying linear programming and I'd appreciate a good site or two that cover the topics well for this field of math which includes:

vectors in a specific dimension, vectors which span a dimension, vectors which form a base in a dimension, groups of vectors which consist of a different group of vectors, and so on.

I'm sure those who have studied this know the kind of linear programming i'm talking about hehe, i just haven't found any comprehensive and clear online material for revision.

Thanks for the help guys