There is a lot going on in the field of cosmology and this course is not fully comprehensive. For the curious student, we provide a short list of materials that expand upon the concepts taught in this course.
Astrobites: A website where the writers are graduate students who summarize recent journal articles in Astrophysics to be read by undergraduates and high-schoolers.
The Dark Energy Survey Darchive: Summaries published by the Dark Energy Survey to convey which convey their results to the general public.
APS Physics Magazine : Summaries of articles published through APS, which contain a broad range of topics.
phys.org : Summaries of interesting articles, specifically in cosmology