How to earn money in Saudi Arabia?

Could you please explain to me the various methods one could pursue to earn money in Saudi Arabia? I'm particularly interested in understanding the job market there, as well as any unique opportunities or strategies specific to the country. Are there any sectors that are particularly lucrative or growing rapidly? Additionally, I'm also curious about any legal considerations or regulations that one should be aware of before starting to earn an income in Saudi Arabia. Could you enlighten me on these matters?