Your question is a bit too broad, but here is something you may want to read, if you are interested in the Mathematical Analysis of Deep Learning:

 https://arxiv.org/pdf/2105.04026.pdf

Your question is a bit too broad, but here is something you may want to read, if you are interested in the Mathematical Analysis of Deep Learning:  The Modern Mathematics of Deep Learning, by Berner et al., arXiv:2105.04026.