Irene Lyon has lots of quality advice on her channel. She is a nervous system and trauma specialist. Julie Yau has a "trauma workbook" with many exercises you

Irene Lyon has lots of quality advice on her channel. She is a nervous system and trauma specialist. Julie Yau has a "trauma workbook" with many exercises you can do on your own. She is also a very compassionate woman with deep knowledge about the nervous system, though her book is practical, not theory. If you really want more theory about nervous system to "trust" the above advice, look into "Nurturing Resilience" by Kathy kain All the best to you.