What is illegal to carry in California?

Can you clarify for me what types of items are considered illegal to carry in the state of California? Are there any specific laws or regulations that prohibit carrying certain objects, such as weapons, drugs, or dangerous substances? Additionally, are there any restrictions or limitations on carrying items like knives, pepper spray, or other self-defense tools? It would be helpful to understand the full scope of what is considered illegal to carry in California to ensure that I comply with all relevant laws and regulations.