finite element – Is there any book about fundamental FEM theory using similar terminology as Comsol MultiPhysics?

I am considering to solve complexed PDE systems, like in this post, using Comsol MultiPhysics. The PDEs are different from the General Form provided by Comsol. The Weak Form module may be worth a shot.

But I am no export in FEM theory. Even if I become one after learning, there might be a distance from FEM theory to Comsol weak form implementation, say different terminology.

So, I was wondering if there are some books or materials that details the fundamentals of FEM empolying terminology similiar to Comsol, maybe like this website given by Comsol but with much more details as a textbook on FEM theory.
Any suggestions would be appreciated.

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