Hello I am a PC/Linux user for very long time and I have just got my new Mac. I am trying to understand some points... I set up an account during first boot. I assume that this is an administrator account. I want to make entering password obligatory -even for me- before installing any application, especially anything potentially malware/spyware/surveillance apps. How can I do that? If such password can be different than login password, it would be even better. Do I need an antivirus/firewall/antispyware software? If yes, can you suggest me one? I want to be able to return my Mac to its clean status if I mess things up in the future. I made a Time Machine backup after first run. Is this an enough solution for this? Should I get a drive image backup in case I may need reinstall operating system? Any other advice for me for security and privacy? Thank you in advance!