How much money do I need to get residency in Spain?

Could you please enlighten me on the financial requirements for obtaining residency in Spain? I'm interested in knowing the approximate amount of money I would need to fulfill the criteria. Would it differ based on the type of residency I'm aiming for, such as non-lucrative or other categories? Additionally, are there any specific investment options or bank account requirements that I should be aware of? Your insights would be greatly appreciated as I'm exploring my options for relocation to Spain.