Finite element methods:
Can learning a numerical technique such as Finite element methods(FEM) be fun? Currently, there is a large number of texts and lecture series to learn FEM. This the link to the one I felt the best suiting to a person who would want to learn this subject from a mathematical as well as practical perspective. Prof. Gockenbach takes you through the necessary background needed to understand why FEM is not just another numerical method but a mathematically sound generalization of a set of numerical techniques far too extendable.
Link to Prof. Gockebach’s webpage: Prof.Gockenbach
Dynamical systems theory:
Strong anticipation: Link to wiki
Delayed differential equations: Link to an interesting paper
Link to my codes for symbolic MATLAB Code for practical implementation of projection theorem.
The best place to go to learn linear algebra in my opinion:Prof. Gibert strang