Is Weed legal in California?

Good day everyone, I'm curious to know, in the state of California, what is the current legal status of weed? Is it legal to possess, use, or sell weed within the state's borders? I've heard conflicting reports and I'm hoping to get a clear and concise answer to this question. I understand that laws can vary depending on the county or city, but I'm interested in the general stance of the state as a whole. Thank you in advance for your assistance.