I have always been fascinated by Euclidean geometry and it was my favourite subject at school. However, I have noticed that Euclidean geometry is not very popular among pure math students (except IMO students). It seems that most people prefer not to learn more about it and it has become something like a “dead field”. It is weird that geometry is probably the oldest field of math, but I struggle to find books for geometry and I can easily find thousands of good books on calculus, analysis, topology, etc. in minutes. I have tried to find some good books on Euclidean geometry that go beyond the basic school curriculum and cover more advanced topics, such as the nine-point circle, Morley’s theorem, Ceva’s theorem, Menelaus’ theorem, Ptolemy’s theorem, etc. However (I posted questions like this here (asking for book recommendations for geometry that don't use any math other than geometry like linear algebra , group theory ,.. etc) and here (this was my first question on this site before I even knew about dup questions ) ), I have not been very successful in finding such books. Most of the books I have found are either too elementary or too old and I struggled to find any modern book about geometry that goes beyond high school. It seems that nobody wants to write a book about it anymore and that makes me think it is a dead field.
This makes me wonder why Euclidean geometry is so neglected in modern mathematics. Is it because it is not practical or useful for modern applications and technology anymore? Is it because it is an old field? Is it because it is not relevant or interesting anymore? Personally, I do not think any of these reasons are valid. I think the reason for someone to study pure mathematics is curiosity and interest not how practical and applicable math is and I think that geometry is still interesting and worth studying but I still don't understand why nobody cares about it anymore.
