Welcome to Physics Forums. We can probably help with GR. Post in the Special and General Relativity or Cosmology forums (linked from the front page), depending on whether your interest is GR or more about the large scale structure and history of the universe.
Do be aware that LLMs often speak confident nonsense about physics because there isn't enough reliable discourse on the topic in their corpuses and there's too much maths in what is reliable. So anything you've learned from them has a high probability of being wrong. You may also want to double check the forum policies (see Terms at the foot of the page) on AI and on personal theories, depending on exactly what you mean by "BIG questions".